补全短文
Passage 1 Functions of power transmission CEADB
The function of (1) is to send power from power plants to load center or to exchange 。。。
A. step-down substations and connected transmission equipment
B. power network operation
C. power transmission
D. transmission at high voltage
E. power networks
Passage 2 Substation misoperation and its preventing CEABD
The misopemti on that can lead to (1) mai nly are :① on-load switch ing of isolat ing switch ；
A. preventing the misoperation in substation
B. the closing of grounding switch with power on
C. accidents in the electrical operation of the substation
D. the persons from illegal entering the lived bay
E. the grounding wire (closing the grounding switch) with power on
Passage 3 A brief introduction on the development of supercritical boilers and their main advantages BDEAC
In (1) such as U.S.A ，Japan and European countries ，the supercritical 。。。
A. good homogenization of distribution
B. some advanced countries
C. whole process management is strengthened
D. great advantages oil economy and environmental protection
E. subcritical once-through boiler
Passage 4 Steam generation and use BEADC
Steam is one of man 's dependable servants More and more in the background ，。。。
A. first generating steam
B. an electrically heated home
C. use of steam for electric power generation
D. the new generating capacity being installed
E. the fuel is uranium and the heat is supplied
Passage 5 Circuit breaker BDAEC
Circuit breakers are automatically operated high voltage (or high current) switches. 。。。
A • to perform any switchi ng operati on after long periods
B. to control electrical power networks
C. of the circuit breaker
D. to switch the current which can be from a few amperes
E. of the highest importance for high reliability
Passage 6 The ratio of distance to height of pumped-storage power plant BDACE For pumped-storage power plant, generally the ratio of distance to height (l),
。。。
A. is most economic
B. is used to evaluate topographic condition of power plant
C. is not desirable
D. is the ratio of horizontal distance between upper and low reservoir
E. is the best
Passage 7 Fuel cells BAECD
Fuel cells are devices that when a fuel such as hydrogen or hydrogen-rich compounds and oxygen are supplied to 。。。
A . further development is under way
B. there is no storage capacity in a fuel cell
C. many cells are operated in series to obtain voltages
D. supply alternating current from fuel cells
E. as they are being developed there have been some applications Passage 8 Substations pace into the Digital Age CAEBD
Substations constitute the main part of power transmission and distribution in a
power grid. 。。。
A. substation automation technology has reached a certain level
B. simulation training technology for substation operation
C. composed of a large number of primary and secondary equipments
D. a full-digital automation system
E. all of which has become an indisputable fact Passage 9 Overcoming the Problem of Waste CADEB Many large cities are anything but beautiful Streets are littered with trash. In this trash, however,
(1) 。。。
A. there is no time to be lost
B. building beautiful cities out of garbage is only a dream
C. there is still something that can be useful
D. it can be put to use again
E. more and more machines are designed for this purpose Passage 10 Hibernation EBDAC
The weather in winter. Call be very cold. Some animals sleep during the winter,
A. So they don ' t need to worry about bad weather and other dangerous animals
B. We call this kind of sleep in wintertime “ hibernation ''
C. As it gets warmer and warmer in spring ，the sleeping animals begin to wake up and
look around for food
D. Hib ernating animals don ' t need to eat much because they don ' t move
E. They can sleep for a long time Passage 11 Satellites BDACE
The body that is neatest to the Earth is the moon. (1). This satellite is 。。
A. The bigger and heavier a body is, the greater is its force of gravity
B. It circles the Earth and is therefore know as a satellite of the Earth
C. To get out into space we have to overcome the Earth ' s gravitational pull
D. A satellite stays in orbit because the planet gravitational force keeps pulling it into a circle
E. Artificial satellite can be used for various purposes Passage 12 Secondary equipment in power system BDEAC
The secondary equipments in power system are (1), measuring ，regulating ，。。。
A. 5A rated current of the current transformer secondary winding
B. the equipments that provide protecting ，monitoring
C. 50V rated voltage of PT secondary side
D. the equipments that send the command signals
