浦东初中补习班浦东春季补习班新王牌初二物理王I老师机械和功07

上海浦东新区哪有暑期补习新初三物理化学的辅导班一对一辅导网权威发布上海浦东新区哪有暑期补习新初三物理化学的辅导班|收费贵不贵，更多上海浦东新区哪有暑期补习新初三物理化学的辅导班|收费贵不贵相关信息请访问一对一辅导网。

上海哪有暑期补习新初三物理化学的辅导班|收费贵不贵？相比传统的班级式辅导，我们的服务模式是根据每个学生的需求和喜好量身定制个性化辅导方案，同时匹配全职的专业辅导小组进行一对一的辅导，通过提高学生的学习成绩、激发学习兴趣和全方面的提高，已经赢得了成千上万的家长和学生的信赖。

上海口碑比较好的辅导机构咨询电话（即日起拨打400免费热线电话有免费试听课，400询电话使用方法：先拨前10位总机号，听到提示音后再拨后几位分机号即可咨询详情或预约对孩子学业进行免费测评）：上海精锐教育-免费咨询电话：400-0066-911转分机12326 【浦东新区】第一八佰伴联合中心、新大陆广场中心、金桥中心、浦东三林中心、成山路中心、川沙绿地中心、南汇惠南中心、巨峰路中心、周浦万达中心上海京翰教育-免费咨询电话：400-0066-911转分机77657 【浦东新区】八佰伴校区、金桥校区上海智立方教育-免费咨询电话：400-0066-911转分机14999【浦东区】八佰伴学习中心、金桥学习中心上海学大教育-免费咨询电话：400-0066-911转分机10793 【浦东新区】陆家嘴校区、金桥校区、耀华路校区、周浦校区、高桥校区、源深校区、惠南镇校区、联洋花木校区、川沙校区上海智康教育-免费咨询电话：400-0066-911转分机12253 【浦东新区】八佰伴校区【招生范围】只招收小学、初中、高中各年级【热门课程】小初高各年级各学科同步辅导、数学，英语，物理，化学，作文，语文，历史，地理，生物。

小升初、衔接班、奥数班、冲刺、艺考辅导。

【上课时间】周六日、寒暑假、平时晚上等时间灵活协商安排！以上的是各个学校的免费咨询电话，课程费用因年级不同、科目不同收费不同，家长如需给孩子提高学习成绩可直接拨打上面400免费电话咨询。

绪言综合一、填空题：1.完成下表中的填写：物理量国际（主）单位实验室测量工具长度质量打点计时器2 .某同学测量了一些数据，但忘了写单位。

请给他补上合适的单位：①一只鸡蛋的质量约为60 _______；②一个乒乓球的直径约为40_________；③小红的身高165 ；④一节课的时间为40 。

3.___________________________叫质量。

一枚金牌的质量约为152克，合_______千克；放在杯子里的冰块完全融化成水时，它的质量将________（选填“变大”、“变小”或“不变”）。

4.测量的目的是为了进行可靠的比较。

因此，测量首先需要一个公认的标准，也就是________；其次，要有合适的___________。

5.在国际单位制中，长度的单位是_________。

质量是物体本身的一种_____。

质量在国际单位制中的单位是________。

一块冰融化成水以后，没有发生变化的量是 ________（选填“质量”或“体积”或“形状”）。

6.正确的测量结果由和组成，刻度尺的准确程度是由来确定的。

7.刻度工具上相邻两条刻度之间的长度叫，它决定了测量的精确度，测量时要选用和适当的测量工具。

8.用皮卷尺测量教室的长度时，若用力拉伸卷尺，使卷尺变形伸长，则测量结果比准确值（填偏大或偏小）9.物体中所含物质的多少叫做质量,通常用符号_______表示。

国际单位是，用符号表示。

在实验室中测量质量的常用仪器是。

10.将铜棒拉成铜管，质量；100克水结成冰块质量；（选填“变大”、“变小”、“不变”）；质量是70千克的宇航员，由地球到达月球后，他的质量应是千克。

11.用天平测物体质量时，若使用的砝码已经磨损，则测量结果比物体真实质量。

(选填“大”或“小”)12.打点计时器是测量的工具。

通电时，振针每秒中上下振动50次，每打两个点的时间间隔为秒。

如图2为打点计时器打出的纸带，A、B之间的时间间隔 B、C之间的时间间隔（选填“小于”“等于”或“大于”）。

浦东新王牌初中补习班初二物理第一讲 张YW 老师光的反射1.光在同种均匀介质中沿 传播。

光在 中传播最快，在空气中也取 m/s 。

日食、月食、影子、小孔成像都可以用光的 来解释。

2.下列物体：太阳、月亮、蜡烛的烛焰、钻石、波光粼粼的水面、乌黑发亮的头发、篝火、萤火虫中，是光源的是 。

3．光在____ __ 介质中沿直线传播，光在____ __中的传播速度最大，数值是______千米/秒。

4． 打靶时要求三点一线，即缺口、准星、靶心在同一直线上，这样子弹才容易命中目标，这是利用了光在均匀介质中沿 的原理.5.光源：能够发光的物体叫光源，例如： 、 等。

眼睛要看见东西，必需要有 射人眼睛。

6．物理学中用一条带箭头的直线来形象地表示光的 和 ，这样的直线叫做光线。

光线实际上是 的。

（选填“存在”或“不存在”）7.光射到两种介质的界面时 传播方向，返回到 介质中的现象叫光的反射。

8．经过大量的实验总结出反射定律的内容是：光发生反射时， 光线 、 光线和 在同一平面内； 光线 和 光线分别位于 的两侧； 角等于 角 。

在光反射现象中光路是 的。

9．在图1中， 是入射点， 是入射光线， 是反射光线， 是法线， 是入射角， 是反射角。

10．我们能看见本身不发光的物体，是因为光射到物体表面时发生了 ，无论在哪个方向都有光射入眼睛。

11．在图2中，根据给出的反射光线OB 画出入射光线AO ，并标出入射角及其度数。

A12．在图3中，根据给出的入射光线AO 画出反射光线OB ，并标出反射角及其度数。

13．当入射光线与镜面的夹角为40º时，反射光线与入射光线的夹角为 度。

14．当入射光线垂直射向镜面时，入射角为 度，反射角为 度，光的传播方向改变了 度。

15．在光的反射现象中，光路是 的，当入射光线逆着原来反射光线射到平面镜上，这时反射光线将逆着原来 的方向反射出去。

16．在一般情况下，我们从不同方向都能看到黑板上的字，是因为发生了 反射；O B N N O B 图1 图2 图3而黑板某一处发生“反光”，是由于光射到这一部分时发生了 反射。

浦东新区初三补习班【上海浦东新区小学三年级暑期补习班怎么收费一对一辅导网权威发布上海浦东新区小学三年级暑期补习班怎么收费|家教中心信息汇总，更多上海浦东新区小学三年级暑期补习班怎么收费|家教中心信息汇总相关信息请访问一对一辅导网。

小学三年级暑期补习班怎么收费|上海家教中心信息汇总？“在关键的大考冲刺阶段，考生复习一定要注意宜精不宜多。

而且每个孩子个性不同，学习的状态和程度也不同，-好能根据孩子的实际情况‘对症下药’，让这短暂的一百多天的时间里的学习更精准有效。

上海口碑比较好的辅导机构咨询电话（即日起拨打400免费热线电话有免费试听课，400询电话使用方法：先拨前10位总机号，听到提示音后再拨后几位分机号即可咨询详情或预约对孩子学业进行免费测评）：上海精锐教育-免费咨询电话：400-0066-911转分机12326 【浦东新区】第一八佰伴联合中心、新大陆广场中心、金桥中心、浦东三林中心、成山路中心、川沙绿地中心、南汇惠南中心、巨峰路中心、周浦万达中心上海京翰教育-免费咨询电话：400-0066-911转分机77657【浦东新区】八佰伴校区、金桥校区上海智立方教育-免费咨询电话：400-0066-911转分机14999【浦东区】八佰伴学习中心、金桥学习中心上海学大教育-免费咨询电话：400-0066-911转分机10793 【浦东新区】陆家嘴校区、金桥校区、耀华路校区、周浦校区、高桥校区、源深校区、惠南镇校区、联洋花木校区、川沙校区上海智康教育-免费咨询电话：400-0066-911转分机12253 【浦东新区】八佰伴校区【招生范围】只招收小学、初中、高中各年级【热门课程】小初高各年级各学科同步辅导、数学，英语，物理，化学，作文，语文，历史，地理，生物。

小升初、衔接班、奥数班、冲刺、艺考辅导。

【上课时间】周六日、寒暑假、平时晚上等时间灵活协商安排！以上的是各个学校的免费咨询电话，课程费用因年级不同、科目不同收费不同，家长如需给孩子提高学习成绩可直接拨打上面400免费电话咨询。

（徐汇）6．甲、乙两物体同时同地同方向开始做匀速直线运动，甲的速度大于乙的速度，它们的s -t 图像为图1所示a 、b 、c 三条图线中的两条，运动5秒甲、乙间的距离小于2米，则
A. 甲的s-t 图一定为图线a
B. 甲的s-t 图可能为图线c
C. 乙的s-t 图可能为图线b
D. 乙的s-t 图一定为图线c
（闸北）7．甲、乙两物体同时同地同方向开始做匀速直线运动，甲的速度小于乙的速度，它们的s -t 图像为图3所示三条图线中的两条，运动15秒甲、乙间的距离小于5米，则 ( )
A ．甲的s -t 图一定为图线a
B ．乙的s -t 图一定为图线a
C ．乙的s -t 图一定为图线b
D ．乙的s -t 图可能为图线c
图3
7、甲、乙两物体先后从同地沿同方向做匀速直线运动。

甲比乙先运动2 秒，甲运动6 秒时 通过的路程为 6 米，此时甲、乙间的距离为 2米。

在图 3所示的a 、b 、c 三条图线中，乙的 s-t 图像。

A 、一定是图线a B 、一定是图线b C 、可能是图线b D 、可能是图线
c
图1。

U6.U7配套练习（期末习题）U6Choose the best answer( ) 1.He is _______ football nowA playingB play withC playedD play to( ) 2.You had better ________ out for a walk today.A.to not go B not go C not to go D to go not( ) 3.What _______ you like ________ a pizza?I’d like mushrooms and onions on it.A. will; onB. do; inC. would; inD. would; on( ) 4.The roar was so _____ that our blood turned to iceA. excitingB. excitedC. frighteningD. frightened( ) 5. His father is always _____ TV till late night.A watchB watchingC to watchD watch to( ) 6.The city will run out of fuel ______ 2 weeksA atB inC toD for( ) 7. He dreams of _________ a good jobA getB gettingC gotD to get( ) 8._______ eight _______ Monday morning, they landed on an unexplores planetA At inB At /C In onD At on \Rewrite the sentence as required.1. She has dinner with her grandparents once a week. (改为一般疑问句)____________ she____________ dinner with her grandparents once a week?2. The Browns have lived in New York since they moved here ten years ago. (对划线部分提问)____________ ____________ have the Browns lived in New York?3. Could you please tell me how I can operate the machine? (改为简单句)Could you please tell me ____________ ____________ operate the machine?4. We went to France to spend our holidays last summer. (对划线部分提问)____________ ____________ you go to spend your holiday last summer?5. He was so excited that he couldn’t sleep well last night. (保持句意基本不变)He was ____________ excited ____________ sleep well last night.6. I gave my son several books besides a camera. (保持句意基本不变)I gave my son several books and a camera ____________ ____________.B卷Choose the best answer1, The bear was caught in a _______.A. tripB. steelC. tapeD. trap2, Tony, you are here! Where have you _______? I looked for you everywhere.A. goneB. beenC. inD. playing3, The robbers decided to _____ the door and stand _____ the door.A. close, close toB. close to; closeC. close; near toD. close to ; near4, His jokes sent everybody roaring with _____?A. laughtersB. laughC. laughingD. laughter5, Listen! Here is the arrangement of time and place _________ tomorrow’s Open Day.A. ofB. forC. fromD. out of6, They always thought about _____all the aliens ________ dawn.A. killing, inB. killing, atC. kill, inD. kill at7, Mike was so tired that he ______ down on his bed and almost______ asleep at onceA lay, fellB lie, fall C. laid, feels D lain, felt8.The monster looked like a man. It looked ______A like humanB almost humanC unlike a womanD an adultⅡ. Complete the sentences with the right words.1. Billy looks upset. What happened to ________? (he)2. It is said that eight ________ of water a day can help you keep fit. (glass)3. Linton is interested in Chinese history and this is his ________ visit to Beijing. (four)4. Don’t throw the old watch away. It is still ________.(use)5. Fishing is one of my ________ outdoor activities. (favour)Ⅲ. Rewrite the sentence as required.1. Susan has her piano lesson on Saturday afternoon. (改为一般疑问句)________ Susan ________ her piano lesson on Saturday afternoon?2. That new blue car is my father’s. (对划线部分提问)________ ________ is your father’s?3. The new housing estate in the city center is very expensive.（改为感叹句）________ _______ the new housing estate in the city center is !4. Why don’t the twins look the same as each other? (保持句意基本不变)Why do the twins look ________ ________ each other?5. What would Bob like to be in the future? Bob hasn’t told his friends yet.（合并句子）Bob hasn’t told his friends ________ ________ would like to be in the future.Ⅳ. Reading comprehensionJulia Hill, an American woman, was born in 1974. She was 23 years old when she discovered that a company wanted to cut down part of a forest in California. In the forest there were lots of redwood trees. One of the tress was 70 metres tall and 1,000 years old.Julia wasn't happy about this. She traveled to California and climbed up the tree. “If I sit in the tree，”she said，“the company can't cut it down.” At the beginning，Julia planned to stay in the tree for two weeks. She lived in a small tree-house and her friends were very helpful——they cooked food for her every day. She used her mobile phone to talk to her family and to news reporters. She stayed in the tree day and night.Environmental organizations supported her, but other people weren't on her side and they tried to stop her．The company used a helicopter that stayed near her tree-house for a long time．The helicopter was very noisy and there was a lot of wind. Julia didn't like it, but she stayed in the tree.In the end, she was successful. The company agreed not to cut down the redwood. Finally. after two years and eight days in the tree，Julia Hill climbed down and walked on the ground again. She and her friends were very happy．Answer the questions(根据短文内容回答下列问题)：(12分)1.What nationality is Julia Hill?2.How tall and how old was the tree Julia Hill stayed in?The tree was ________ tall and ___________ old.3.How did she keep in touch with others while staying high up in the tree?She kept in touch with others________________________.4.when did she climb down the tree?5.How long did Julia Hill stay in the tree?For__________________________.6.Why did Julia Hill slay in the tree?She wanted to ________________.C卷Choose the best answer1. 31. The workers will finish the repair of Waibaidu Bridge _____ March, 2009.A) on B) at C) in D) for2. The boss said to Billy, “Your idea sounds _______ , we’ll try it in our project”.A) clearly B) fluently C) good D) sad3. A farmer _______ to see a UFO on a clear night two weeks ago.A) took place B) used C) was used D) happened4. Please remove your shoes before entering temples when you are on a tour in Malaysia.A) put on B) have on C) take off D) wear5. The Sun family had a ________ visit to Canada last month.A) ten days B) ten day C) ten-days D) ten-day6. The comic strip needs to be funny or wonderful with an _______ finish and should be full ofaction to keep the reader_______.A) exciting…interesting B) excited…interestedC) excited…interesting D) exciting…interested7. I live in a room ____ window opens to the south .A. whichB. of whichC. itsD. whose8 . A friend ____need is _____ friend indeed .A. in , /B. for , aC. in , aD. for , theComplete the sentences with the right words.1. China hosted _______ first Olympic Games from August 8 to 24.(it)2. There are a lot of British words not _______used in the United States. (wide)3. The _______of the computer marked the beginning of a new era. (invent)4. I _______ this is their house but I'm not sure. ( thought)5. Obama's honesty and _______ have made him president of the United States. (wise)6. You shouldn’t depend on your parents any more. You must be _______.(depend)Rewrite the sentence as required.1.He has already stored the food in his cupboard. （改为一般疑问句）_______ he stored the food in his cupboard_______?2.Chinese are very proud to see the success of Shenzhou 7 mission. （改为感叹句）_______ _______ Chinese are to see the success of Shenzhou 7 mission!3.Mei Lanfang started learning Peking Opera at 7 in Beijing. （对划线部分提问）_______ _______Mei Lanfang start learning Peking Opera at 7?4.The British government controlled the island at that time. （改为被动语态)The island _______ _______ by the British government at that time.5.To climb such a high mountain is impossible for me. （保持句意不变）_______ _______ impossible for me to climb such a high mountain.6I won't go to the party unless I'm invited. (保持句意不变)I _______ go to the party _______ I’m invited.Fill in the blanksMy old friend, Harrison, a British gentleman, was a retired banker. Harrison had worked and lived in the Mediterranean for many years b (92) he returned to England. Harrison had often dreamed of retiring in England , his hometown ,where he spent his childhood happily, he had p (93) to settle down in the country. He had no sooner returned in July than he bought a house and went to live there. Harrison had thought of everything e (94) the weather. Almost immediately he began to complain about the weather, for even though it was still s (95) ,once the most sunshiny days of this period with his schoolmates playing outside during their holidays, it rained continually and it was often bitterly cold.After so many years of e (96) the sunshine in the Mediterranean, Harrison got a shock. He acted as if he had n (97) lived in England before. In the end, Harrison had to admit that the weather of his hometown was more than he could bear. He had h (98) had time to settle down when he sold the house and left the country. The dream of my poor friend had had for so many years ended there.U7A卷Ⅰ. Choose the best answer1. I’m _______ to carry the commodity.A strong enough notB too strongC so strongD strong enough2. Jake spoke before I finished my words. He _____ me.A toldB interruptedC askedD welcomed3. Peter was hiding _______ the kangaroos at that time.A withB inC amongD between4. We need a _______ of flour for making a cake.A packetB pocketC pairD piece5. It’s my holiday next week. I _______ photos of elephants in the zoo.A have takenB am going to takeC will printD am going to buy6. The good news made Linda _____ excited _______ she couldn’t get to sleep.A. enough, toB. too, forC. too, toD. so that7 Last week the sick man _______ in bed for a few daysA liesB layC liedD laid8. There ________ a class meeting tomorrow morning. The teacher will tell the students something important.A. will haveB. is going to haveC. is going to beD. are going to haveⅡ. Complete the sentences with the right words.1. Who will ______________ (can, be able to) finish this work in two hours?2. The US soldiers started to ________ (attack, attract)3. Building C is 20 __________ (stories, storeys).4._________(A, The) number of old people in Shanghai is rising these years5.The fireman carried the little girl to _______ (save, safety)Ⅲ. Rewrite the sentence as required.1.The American spacecraft Galileo travelled and worked in space for 14 years.(对划线部分提问)did the American spacecraft Galileo travel and work in space?2. Jack's mother asked him, “Have you packed your things?"(保持句意基本不变)Jack's mother asked him he packed his things.3. After a quick breakfast, Mary left in a hurry. (保持句意基本不变)After a quick breakfast, Mary __________.4. Shall we fly a kite in the countryside this Sunday?（保持句意不变）flying a kite in the countryside this Sunday?Ⅳ. Reading comprehension下面是对将来生活的描述，请将描述与上面图片配对。

二、实验题典型分析：1.小王做“测定小灯泡电功率”实验，现有电源（电压保持不变）、待测小灯、电压表、电流表、滑动变阻器、电键及导线若干，其屮待测小灯上只有所标“0.22A”（指小灯正常工作电流）字样清晰可见。

他正确连接电路，实验步骤正确，闭合电键，移动变阻器的滑片至小灯正常发光时，变阻器接入电路的电阻恰为最大阻值的一半，但此时无法从电压表V上精确的读111额定电压。

在上述实验过程中，电流表4额示数范围为0.20-0.22 ^o经思考后，他在电路中再连接一个电压表V’并按规范重新实验，发现电压表V的示数从2.0伏逐渐变大、电压表V’的示数从4.0伏逐渐变小。

①请写出小王将电压表V’接在电路中的位置。

__________ （132 _______②请根据相关信息计算岀小灯的额定功率。

__________ （14） ______ （需写出计算过程）2.小陆同学做“用电流表、电压表测量电阻”实验，现只有电源（电压大于3伏且保持不变）、待测电阻Rx、电压表（0〜15伏量程档损坏）、电阻为10欧的定值电阻&、阻值为30 欧的定值电阻《、电键及导线若干。

他经过思考，进行三次实验，电路图及闭合电键S后对应的电压表的示数分别如图15 （a）、（b）、（c）所示。

请根据相关信息计算（需写出计算过程）：①小陆同学所用的电源电压U _____________ O②待测电阻&的阻值。

（计算电阻时，精确到0.1欧）R\R(a)(b)(c)3.小陆做“电流表、电压表测电阻”实验，现有电源（电压为6伏且保持不变）、待测电阻Rx、电流表、电压表、滑动变阻器、电键及导线若干，所有元件均完好。

他连接电路进行实验，闭合电键后，在移动变阻器滑片的过程中，发现电流表示数的变化范围为0.20~表、电流表的示数分别如图13 （a）、（b）所示。

请将下表填写完整。

（计算电阻时，精确至!J 0.1 欧） ____理最实验序电压Ux（伏）电流lx（安）电阻Rx（欧）电阻氐平均值（欧）10.200.58 安,电压表示数相应的变化范围为4.0~0伏, 当移动变阻器滑片到某个位置时，电压4. 学习了压力，小明认为受力面所受压力的大小总等于施力物的重力大小。

八年级春季班教学计划
吴L老师
第四章机械和功
4.1，简单机械
1.杠杆的基础知识（教会学生能精准找出支点画出力和力臂）
2.杠杆的平衡条件（是教学的重点和难点，学生要能够找出最长力臂，求最小力）
3.杠杆的分类根据杠杆的动力臂和阻力臂的大小关系分为三类，学生要能够辨别常见的杠杆是属于哪类杠杆
4.机械功机械功率
5.机械能
第五章热与能
6.温度温标
7.期中复习
8热量比热容
9.内能
10.热机
提前学习初三学期的内容
第六章密度
11密度一
12密度二
13期末复习（一）
14期末复习（二）
春季课程第四章上课内容是在寒假的基础上进行提高，上课进度基本与学校同步，可以根据学生的具体情况在教学的难度和进度进行适度调整，若有家长和学生有宝贵的合理的意见或建议，可及时和教务人员或与我直接联系！。

液体压强专项提高一、选择题1．如图1所示，三个底面积不同的圆柱形容器内分别盛有A 、B 、C 三种液体，它们对容器底部的压强相等，现分别从三个容器内抽出相同深度的液体后，剩余液体对容器底部的压强p A 、p B 、p C 的大小关系是 （ ） A p A ＞p B ＞p C 。

B p A ＝p B ＝pC 。

C p A ＜p B ＜p C 。

D p A ＝p C ＞p B 。

2．内都装有水的两个完全相同的圆柱形容器，放在面积足够大的水平桌面中间位置上。

若将质量相等的实心铜球、铝球（已知ρ铜 ＞ ρ铝）分别放入两个量筒中沉底且浸没于水中后（水未溢出），两个圆柱形容器对桌面的压强相等， 则此时水对圆柱形容器底部的压强大小关系为 （ ）A 放铜球的压强大。

B 放铝球的压强大。

C 可能一样大。

D 一定一样大。

3．如图2所示，底面积不同的薄壁圆柱形容器内分别盛有液体甲和乙，液面相平。

已知甲、乙液体对容器底部压强相等。

若分别在两容器中放入一个完全相同的金属球后，且无液体溢出，则 （ ）A 甲对容器底部压强可能等于乙对容器底部压强。

B 甲对容器底部压力可能小于乙对容器底部压力。

C 甲对容器底部压强一定大于乙对容器底部压强。

D 甲对容器底部压力一定大于乙对容器底部压力。

4．如图3所示，两个底面积不同的圆柱形容器内分别盛有不同的液体A 和B ，已知两容器内液面等高，且液体的质量相等。

现将实心金属球甲浸没在液体A 中、实心金属球乙浸没在液体B 中，均无液体溢出，这时A 、B 两液体对容器底部的压强大小相等，则 （ ）A 甲的体积小于乙的体积。

B 甲的体积大于乙的体积。

C 甲的质量小于乙的质量。

D 甲的质量大于乙的质量。

图25．如图4所示，两个底面积不同的圆柱形容器内分别盛有不同的液体甲和乙，已知两容器内液面等高，且甲液体的质量等于乙液体的质量。

若要使两容器内液体对容器底部的压强相等，则可）A 向两容器内分别倒入相同高度的液体B 向两容器内分别倒入相同体积的液体C 从两容器中分别抽出相同高度的液体 D从两容器中分别抽出相同体积的液体6．如图下所示，两个底面积不同的圆柱形容器甲和乙，容器足够高，分别盛有水和酒精（ρ水＞ρ酒精），且两种液体对容器底部的压强相等。