154题题目1]Which signal of the followings is not provided with onboard lifeboat?A. Rocket parachute signalsB. Buoyant smoke signalsC. Hand flare signalsD. Self-igniting signals[2]According to IMO regulations, ______shall be posed outside lifeboat?A. the retro-reflective tapesB. the reflective tapesC. the flashing bandsD. the anti-flashing bands[3]Which one of the following is not required on survival crafts?A. Anti-seasickness medicineB. Immersion suitsC. axesD. lifebuoys[4]Have the safety belts for _______been examined?A. total enclosed lifeboatsB. totally enclosing lifeboatsC. totally enclosed lifeboatsD. total encloseing lifeboats[5]The fire-protected lifeboats are found_____________.47A. in satisfactorily conditionB. satisfactorilyC. satisfactoryD. satisfactored[6]We test the water spray fire protection system of fire-protected lifeboats every 3 months, ___the abandon ship drill.A. combining withB. combined withC. combining toD. combined to[7]Are your lifeboats fitted with_______?A. cargo wiresB. topping liftC. guiding linesD. tripping line[8]Painting on _________is prohibited because it will weaken its sensibilityA. ship shellB. exterior of winchesC. hydrostatic release unitD. hold ladders[9]Where shall the key to CO2 room be kept?A. In master's cabinB. In third office's cabinC. In a break-glass-type enclosure conspicuously located adjacent to the roomD. In a locked locker conspicuously located adjacent to the room[10]The fireman's outfit consists of________.A. Safety lamp, protective clothing ,rigid helmet, breathing apparatusB. Emergency escape breathing device, fire damper, extinguishersC. Firefighting equipment, portable extinguishers, fire dampersD. Fire hoses, fire nozzles, fire hydrants, fire pumps[11]Which one of the following is incorrect about Mercator projection?A. It projects a sphere onto a cylinder.B. Because the resulting distance between latitudes are constantly increasing, it is also called progressive projectionC. It can always give true distancesD. Its advantage is that longitudes and latitudes are at right angles, which makes it easy to read true bearings[12]Why do distances always have to be measured from the nearest scale on a Mercator chart?A. Because it is the most efficient wayB. Because it varies for each latitudeC. Because it varies with the change of longitudeD. Because it is the most straight line.[13]What is ship's heading? Ship's heading is the direction_______.A. the vessel is pointing.B. the vessel is traveling relative to landC. the vessel is traveling relative to groundD. the vessel is drifting[14]How long would 15 minutes of longitude be at a latitude of 60 degrees North?A. 30 nmB. 60 nmC. 15 nmD. 7.5 nm[15]Which one of the followings is incorrect about magnetic compass?A. The magnetic compass is compulsory on my vesselB. The magnetic compass is prone to errorC. The magnetic compass is always placed inside steel constructionsD. The magnetic compass needs to be calibrated to compensate for local magnetic distortion[16]Which one of the followings is correct regarding the use of gyrocompass? 47A. Gyrocompass does not have to be started before sailing.B. Gyrocompass must be stopped when vessel alongside a berthC. Gyrocompass needs to be checked from time to timeD. Gyrocompass is not influenced by the latitude and ship's motion[17]What may affect the accuracy of sounding with echo sounder?A. Sea bottomB. Ship's speedC. Speed of currentD. Water temperature and density[18]What often happens when using echo-sounder at river estuary where a layer of fresh water lies o n the top of denser salt water?A. A scattering layer appears.B. Echo sounder stops working.C. shallow water appears.D. Nothing abnormal happens.[19]Regarding the use of GPS, which one of the followings is incorrect?A. GPS is the most accurate global system today.B. Its use is still under the U.S. Department of Defense’s controlC. DGPS is more accurate than GPSD. GPS can provide a real-time position under any condition[20]Without doubt the radar is a highly important navigation aid. But duty officer shall be aware that_____when using it.A. its range reading is more accurate than its bearing readingB. a low-lying coastline with a long, flat beach will show up properly on the radarC. radar is only aimed at collision avoidance.D. the use of radar is necessary only when visibility is restricted.[21]As for racon, which one is incorrect. in the following?A. Racon is a radar transponder.B. Racon is often installed on major waypoints.C. When activated by a radar signal, the Racon sends it back with an identifierD. Racon can be used to take place of radar[22]What does a Racon help with?A. Measuring the distanceB. Measuring the relative speedC. Identifying a vesselD. Identifying a seamark[23]What does ECDIS stand for? AIS LOA MARPOL IMDG ISM SSP SSO ETD MFAG IOPP IRPCSA. Electrical Chart Display and Indication SystemB. Electronic Chart Display and Information SystemC. Electric Chart Display and Informing SystemD. Electronic Chart Display and Indicating System LEEW AY=LATERAL MOVEMENT[24]The IALA buoyage system is divided into two categories:________.A. The buoy system and the lighthouse systemB. The central buoy system and the side buoy systemC. The lateral system and the cardinal systemD. The stripe system and the band system[25]The lateral system is used in_______.A. restricted water such as shoals, reefs or wrecksB. restricted water such as buoyed channelsC. open waters such as shoals, reefs or wrecksD. open waters such as buoyed channels[26]In region A, the green buoys are kept to_____ and red to _____when sailing from____to____.A. starboard, port, sea, landB. starboard, port, land,seaC. port, starboard, land, landD. port, starboard, sea, sea[27]Which one of the followings about Traffic Separation Scheme(TSS) is incorrect?A. TSS separates inbound and outbound traffic in well marked lanes.B. Regulations request all vessels to join or leave lanes at the extremities.C. If a TSS has to be crossed, it has to be carried out as close as possible to a right angleD. Being in the TSS does change the general rule of the Road convention[28]How do you take a running fix?A. By measuring the angle between to fixed landmarks and finding the sine of the angles.B. By taking bearings from a landmark at time intervals and finding the sine of the angles.C. By taking bearings from a landmark at time intervals and measuring the distance covered in the intervals.D. By taking the relative bearings from 2 sets of landmarks and plotting the difference.[29]Who has the right of way in a Traffic Separation Scheme?A. The inbound vesselB. The outbound vesselC. The vessel coming from the starboard sideD. The vessel coming from the port side[30]What would be the colour of an IALA starboard hand lateral buoy, as seen when sailing toward land, in Europe?A. GreenB. RedC. Red and green stripesD. Black and yellow stripes[31]As the tide makes the water _______twice a day a resulting current, or tidal stream, is generated. a resulting current, or tidal stream, is generated.A. rising and fallingB. Rose and fellC. the rise and fallD. rise and fall[32]When reversing, the tidal stream will have a period with little or no effect. This is called the______. 47A. RiseB. RangeC. SlackD. Spring[33]The average time between two high waters is 12 hours and 25 minutes because this is the time it takes for____.A. the sun to be at the opposite side of the moonB. the moon to be at the opposite side of the earthC. the moon to be at its apogeeD. the sun and the moon to be on the same side[34]What is the tidal height?A. Twice the tide amplitudeB. The range of the tideC. The water above the Lowest Astronomical TideD. The height above or under the mean level[35]What is the right way to use VHF CH16 and working channel?A. Ships can call other ships on Ch16 but should move to a working channel as soon as possible.B. Ship should use working channel to call other ships at any time.C. Ch16 is only used as the international distress and calling frequency.D. Ship can use Ch16 or working channel as they like[36]How to report your ship callsign to a shore station?A. Use capital lettersB. Use phonetic alphabetC. Use letters and numbersD. Use flag signals[37]Which one of the followings is not a right way to call an unknown vessel byVHF?A. According to her characteristicsB. According to her cargoC. According to her movementsD. According to her crewmembers[38]If there were suddenly an immediate danger for both the vessel and its crew, would you send a MAYDAY on__?A. Ch06 with dual watchB. Ch06 with 25 watts outputC. Ch16 with 1 watt outputD. Ch16 with 25 watts output[39]In the unlikely event that a distress situation allows you to send only a very short message, after MAYDAY would you first say______?A. your name and callsignB. your positionC. the number of persons on boardD. the nature of the distress situation[40]The GPS satellite orbits the earth in approximately_______. 47A. 3 hoursB. 6 hoursC. 12 hoursD. 24 hours[41]GPS receiver errors depend on ________.A. operationB. installationC. display typeD. construction[42]Error in the GPS positions has nothing to do with _____.A. user clock biasB. satellite clock biasC. atmospheric interferenceD. ship's position[43]What is the main purpose of DGPS?A. Improve positioning accuracyB. Decrease positioning accuracyC. Reduce operational costD. I don't know[44]The accuracy of the DGPS mainly depends on_______.A. the price of the equipmentB. the relative angle between the satelliteC. the position of the observerD. the age of the calculated correction[45]What is the purpose of a Pedestal（基座，柱脚）Roile?A. To change the direction of lead on a mooring lineB. To secure a chainC. To secure the eye of a mooring lineD. To facilitate towing[46]You stand a greater risk of injuring yourself or your shipmate during mooring and unmooring operations than at any other time. So remember________.A. Do not wear safety shoes, gloves and an overall with long sleevesB. Stand as closely as possible in the rope railC. Do not work too close to the drum when handling wires/ropesD. If the line takes charge, try to stop it with your feet/hands[47]Which one of the followings is not a right way to behave during mooring unmooring operation?A. Stay close to the towline at all timeB. Beware of the bightsC. When operating the winch/windlass, ensure that you yourself understand the controlsD. When the tug is being secured or let go, monitor the operation closely[48]The most serious danger from synthetic ropes is ____,which is the sudden release of the energy stored in the stretched synthetic line when it breaksA. RottingB. Wear and tearC. SnapbackD. Weakness[49]Unlike wires, synthetic ropes do not give audible _____of pending failure and may not exhibit any broken elements before completely partingA. brokenB. slackC. trackD. sign[50]A ship does not possess an all-wire or all- synthetic mooring outfit, the best procedure is to use____ for spring and breast lines and _____for headlines and stern lines.A. The synthetic ropes, the wiresB. The wires, the synthetic ropesC. The wires, the synthetic ropes with the wiresD. The synthetic ropes with the wires, the same as the former 51．The ideal rope for stoppers should satisfy the following requirements except that _____.A. The stopper should be of synthetic fibre ropeB. The size of the stopper should be as large as possibleC. The stopper should be of low stretch materialD. The stopper should be very flexible52. Usually, do not use more than _____ complete rope turns around the drum.A. 1-2B. 3-4C. 5-6D. 7-853．If you have steel wire ropes leading in the same direction with other ropes, which will take the most of the load?A. Steel wire ropeB. ManilaC. NylonD. Polypropylene rope54. Snapback is a serious danger when we are handling_____.A. Wire ropeB. Nylon ropes onlyC. Synthetic ropesD. Manila55. Choose one statement which is correct according to safe mooring practice.A. Synthetic rope can be used as a stopper on wiresB. A safety helmet without chinstraps is allowedC. ……. have the same elongation as used ropesD. Two or more lines leading in the same direction should always be of the same material.56. What does a navigator who uses an ECDIS require?A. Good navigational knowledge and a professional job attitudeB. Good computer knowledgeC. Good system knowledgeD. Nothing special57. When own ships position input to ECDIS wrong, what is the result?A. NothingB. ECDIS will give warningC. ECDIS will automatically be switched offD. Position, range and bearing taken on the ECDIS will be wrong58. What should you avoid when receiving work order?A. Having other people help you with your workB. SwearingC. Wasting time on having procedures explainedD. Misunderstandings59. What kind of information does the fire plan contain?A. Fire alarm signal, fire instruction and your assignmentB. location of firefighting equipment onboardC. How to use firefighting equipment onboardD. Information on how handle different types of fires60. Do you need to measure oxygen levels before entering an enclosed space?A. Yes, alwaysB. NoC. Not if you measure for toxic gasesD. Yes, but not if you ventilate properly first for 24 hours61. What is the most important treatment concerning a foreign body in the eye?A. Rinsing of the eyeB. anaestheticC. Wring the eye-lid to prevent blinkingD. Close the eye for a while62. What is the meaning of UEL?A. Upper exposure levelB. Upper explosion levelC. Upper explosive levelD. Upper evaporation level63. In which way may intake of poisoning material not occur?A. By inhalingB. By skin penetrating and skin absorbingC. By swallowingD. By protective measures64. What is OPA 90?A. Oil Production Act of 1990B. ore Pollution Act of 1990C. Oil Pollution Act of 1990D. Ore Production Act of 199065. What is the maximum oxygen percentage allowed in a tank?A. 12%B. 6%C. 8%D. 10%66. What does OBO mean?A. Oil Bulk OilB. Ore Bulk OilC. Only Bulk OreD. Only Basic Oil67. What is the meaning of LEL?A. Low evaporation limitB. Lower exposure limitC. Lower explosive limitD. Low explosion level68. What kind of fixed extinguishing plant is installed in an oil tankers engine room and pump room?A. Powder plantB. Foam plantC. CO2 plantD. Water spray plant69. Before any portable gas indicators are brought to the measuring spot, what is very important to do with these analysers first?A. To do a full calibrationB. Just renew the batteriesC .Zero adjust them D. Just check the filters70. Which one of the following factors does not reduce the effect of free surface?A. Minimum number of daily service tanks in useB. Where possible, tanks either full or emptyC. GZmax at minimum 25°D. Bilges pumped out71. Where is the draft largest when the ship has an aft trim?A. ForwardB. AftC. MidshipsD. The drafts are equal all over the ship72. What percentage of the baggage is required to be checked at Security Level 1?A. 25-50%B. The percentage is not specifiedC. 100%D. 5-15%73. Who is responsible for the development of the ship security plan?A. The company security officerB. The classification societyC. The port facility security officerD. The ship security officer74. Who is responsible for the regular security inspections of the ship?A. The company security officerB. The classification societyC. The port facility security officerD. The ship security officer75. For whom is the ISM Code mandatory?A. All vessels 500 GRT and aboveB. All tankersC. All vessels built after 1998D. All vessels on international routes76. Who can contact the Designated Person?A. The designated personB. The captainC. All senior officerD. All officers and crew77. Who can suggest changes to the SMS? C. All officer and crew78. How many hours of rest is the minimum required in a normal day?B.10 hoursC. 6 hoursD. It doesn’t matter as long as my overti me is paid for79. The ISM code is pat of _____.A. SOLASB. STCWC. MARPOLD. High Speed Craft Code80. When are you allowed to throw plastic garbage overboard?A. Being more than 25 miles from shoreB. Only at night when it’s da rkC. Being more than 6 miles from shoreD. Never81. Why is the ISM Code mandatory?A. To satisfy US CoastguardB. To improve safetyC. To save money for the companyD. To get lover insurance premiums82. Why should you report accident to the Designated Person?A. To find some one to blameB. To prevent it from happening againC. So the company can calculate your safety bonusesD. To be able to receive an insurance claim83. Shipboard Emergency Drills must be carried out at least_____?A. Once every third yearB. Once a monthC. Once a yearD. Once a week84. What is the purpose of the girders in the tank?A. They support the stiffenersB. They transfer all the sea forces acting on the platingC. They support the stiffeners and take up some of the sea forcesD. I don’t know85. When dose a bulk carrier experience extreme tension in bottom structure during fast rate loading?A. During ballasting in portB. During loading of heavy cargo in mid-ship holdsC. During correct loading pattern, but with heavy cargoD. During loading light cargo in end holds86. What is the difference between static and dynamic forces on a ship hull?A. The former is set up by cargo and sea while the latter by wave actionB. The former is acting during loading and from wave action while the latter before andafter the ship has been loadedC. The former is set up by cargo while the latter by wave actionD. I don’t know87. What is the worse case consideration for the hull girder at sea?A. When the wave crest are fore and aftB. When a wave length between the crests is approximately equal to the length of the shipC. If the wave crest is amidshipsD. When a wave length is two times of that of the ship88. Who is normally deciding which search pattern to use?A. CRSB. OSCC. SMCD. SRU89. What is the meaning of the word “ROGER” when used in radio communication?A. Please repeat your messageB. Not readableC. CorrectD. I have received your transmission satisfactorily90. What type of oil is most suitable for reducing the effect of heavy seas?A. Crude oilB. Fuel oilC. Vegetable oilD. Lubricating oil91. Communication between ship and aircraft is _____.A. Easy and straight forwardB. Difficult because of different radio bandsC. Not possibleD. Not allowed92. When is the parallel sweep search used?A. When searching a small areaB. When searching a large areaC. When searching over hilly terrainD. When searching during night93. The following information may not be required to be communicated to a distressed craft?A. Own vessels identity, call sign, name and positionB. Own vessel speed and ETA to distressed craftC. Distresses crafts true bearing and distance from shipD. Rescue award if successful94. A search and rescue region is _____.A. A search areaB. An area covered by air surveillanceC. An area covered by radar surveillanceD. An area of defined dimensions95. The first ship arriving of a SAR incident should _____.A. Assume OSC dutiesB. Assume SMC dutiesC. Assume ACO dutiesD. Assume SRU duties96. Which standard man overboard manoeuvre is considered the best during bad visibility conditions?A. The Anderson turnB. The single turnC. The one turnD. The Williamson turn97. Can the RCC and RSC use NA VTEX for shore to ship distress traffic?A. YesB. No C Only if no other communication is available D. Only at night time98. What is most important when using expanded square search?A. Accurate navigationB. Constant speedC. Fixed ROTD. Fixed turn radius99. What is most important for visual search purposes?A. Design of individual search patternsB. Design of special search patterns Use of standard search patterns D. Start search immediately100. Dose the COLREG give any preference to ship equipped with radar?A. YesB. NoC. Only during reduced visibilityD. Only in good visibility101. COLREG NO.10 apply to _____.A. V essels sailing in any condition of visibilityB. Vessels sailing in reduced visibilityC. Vessels sailing in good visibilityD. V essels sailing in separation schemes102. How is an uncoded racon displayed on the PPI?A. As a lineB. As a dotC. As small circleD. As a large circle103. What type of radar can activate a racon?A. X-band radarB. S-band radarC. C-band radarD. No radar can104. What is a coded racon?A. A racon which automatically activate itselfB. A racon only work at nightC. A racon which display a morse code on the radar screenD. A future racon expected to be operational after Y2000105. What is the purpose of the radar reflector?A. Making objects less visibleB. Making echoes weaker on the radarC. Making large echoes smallerD. Making small objects better visible106. How to reduce beam width distortion?A. Adjust centre positionB. Adjust brillianceC. Adjust heading markerD. Reduce gain107. Marine radar range accuracy is generally______.A. LowB. HighC. UnstableD. V ery low108. What is the purpose of VRM control?A. To measure distance accuratelyB. To measure bearing accuratelyC. To measure range accuratelyD. To adjust radar monitor109. What course should be fed into a stabilized radar picture?A. Compass courseB. Gyro courseC. True courseD. Course made good110. What is the correct speed input to an ARPA used for traffic surveillance?A. Ground speedB. Speed through waterC. Speed from GPSD. Speed from Doppler111. How does current and drift effect the relative motion, relative vector presentation?A. No effectB. Producing small errors in calculated aspectC. Producing large errors in calculated aspectD. Produce errors in calculated CAP/TCPA112. Does current and drift effect the CPA/TCPA calculations on a true motion display?A. YesB. NoC. Only a little bitD. Yes, very seriously113. What type of fire detectors is the first to go of in case of a fire?A. Smoke detectorsB. Flame detectorsC. Heat detectorsD. Gas detectors114. According to SOLAS the breathing air apparatus that must be onboard shall have sufficient capacity for how many minutes of operation?A. 20B. 30C. 45D. 60115. For most products the fire will die out when the oxygen content is reduced to _____.A. 10%B. 12%C. 15%D. 21%116. Which of these materials has the best heat conduction?A. GasB. LiquidC. MetalD. Wood117. It is important to get familiarized with the emergency exits onboard, when should this be done?A. Within a weekB. Immediately after boardingC. Before boardingD. When you have some extra time118. Emergency compressed air breathing escape sets onboard, shall have a duration of service no less than _____.A. 20 minutesB. 15 minutesC. 10 minutesD. 5 minutes119. Watertight compartments are separated by _____.A. Longitudinal bulkheadB. Tween decksC. DunnagesD. Decks and bulkheads120. Cleaning, painting and repairing work is known as _____.A. Maintenance workB. Lashing workC. Tallying workD. Overtime work121. What is important to remember when using AIS for collision avoidance?A. AIS may not give a complete picture of the traffic situationB. AIS is more accurate than ARPAC. AIS is not as accurate ARPAD. AIS is not allowed to be used for collision avoidance122. What is the required minimum ship reporting capacity for AIS according to IMO performance standards?A. 1000B. 2000C. 4000D. 4500123. In case of AIS overload, what can you expect?A. AIS will shut downB. AIS will “freeze”C. Largest far away drop outD. Closes targets drop out124. Which of the following is defined as static information?A. Navigational statusB. Safety related messageC. MMSID. Route plan125. The AIS transponder is designed to transmit information?A. AutomaticallyB. Semi- automaticallyC. ManuallyD. AIS is not transmitting at all126. How much is AIS overloaded without any significant operational effect?A. 50-100%B. 200-300%C. 400-500%D. No overload is accepted127. Where should you record the crude oil washing after completion?A. Oil Record BookB. Cow manualC. Pumping LogD. Inter plant manual128. Why was COW made compulsory?A. To reduce amount of sludge in cargo tanksB. To reduce pollutionC. To improve cargo outturnD. To prevent corrosion is cargo tanks129. How to avoid vapour emission during filling of departure ballast (non SBT vessel)?A. By simultaneous ballasting and cargo dischargeB. By reducing the IG pressureC. By minimizing the amount of departure ballastD. By closing all the openings130. Where in the tank shall the oxygen level be determined before crude oil washing?A. 1 meter from the deck and in the bottom of the tankB. In the middle of the tankC. 1 meter from the deck and in the middle region of the ullage spaceD. 2 meter from the deck and in the middle region of the ullage space131. Who should sign the ship/shore safety checklist?A. Chief officerB. Ship’s and shore’s representativesC. The surveyorD. The captain132. What kind of action must be taken in the event of total failure of the inert gas system during discharge/COW?A. Stop the discharge/COWB. Call the chief engineerC. Stop the COW and reduce the discharge rateD. Call captain133. Who must be familiar with the Master list and Emergency Instructions onboard?A. The captain onlyB. The officers onlyC. All crew members and other personnel onboardD. Passengers only134. A frying pan catches fire in the galley, which extinguishing agents shall you use?A. WaterB. CO2 or powderC. FoamD. CO2 only135. What is it called when it is possible to ignite the vapour above the oil?A. Flash pointB. Boiling pointC. Ignition pointD. Pour point136. Where do we find information regarding mechanical ventilation in cargo tanks?A. In MARPOLB. In the ISM CodeC. In SOLASD. In the Safety Manual137. Which international convention dealing with fire-fighting arrangements etc. ?A. MARPOLB. SOLASC. Load line conventionD. CRISTAL 138．Where do you find the design standards for new oil tankers?A. In regulation 8 of SOLASB. In regulation 2 of Annex Ⅱ of MARPOL 73/78C. In regulation 13F of Annex Ⅰ of MARPOL 73/78D. In regulation 16(2) of Annex Ⅰ of MARPOL 73/78139. How to determine the density of the slop after tank washing?A. By use of an interferometerB. By use of a hydrometerC. By use of an interfaceD. By use of a thermometer140. When should voyage planning be done?A. During the sailingB. Prior the sailingC. After sailingD. Before the pilot is leaving141. Who is responsible for the voyage plan?A. The person who has done the planningB. The masterC. The navigation officerD. The owner142. When should operational check on navigation equipment be done?A. Regularly, when preparing for sea and entering portB. As often as possibleC. When errors are indicatedD. When time allows143. When steering by autopilot, how often should ...... steering be checked?A. Every dayB. when time allowsC. At least once a watchD. No checking is necessary144．If the officer of the watch must leave the voyage plan, he should _____?A. Make a note in the logbookB. Inform the materC. No special action necessaryD. Check the new plan145. What is important to check when transferring a position from GPS to a chart?A. Reading the position correctlyB. Plotting the position correctlyC. Make sure that the chart and the GPS use same datumD. Make sure the map is updated 146. In coastal water GPS positions should be checked by ______?A. Visual observationsB. Radar observationsC. Buoys and seamarksD. Visual and radar observations147. Ship to ship communications during SAR should be executed by _____.A. VHFB. MFC. SatelliteD. VHF and MF148. Should recommended route information be used together with weather routeing?A. YesB. NoC. SometimesD. Only if recommended by weather routeing149. How much time can be saved by use of weather routeing?A. 2%B. 4%C. 6%D. Impossible to say150. How can you reduce ship’s downwind progress in deep water?A. By lowering the anchor to about 60 fathomsB. By lowering the anchor to about 30 fathomsC. By lowering the anchor to about 10 fathomsD. Not possible151. How can you keep ship head-up into the weather, with the rudder jammed in hard over position?A. By applying astern powerB. By applying emergency full astern powerC. Careful ahead manoeuvringD. Not possible。
