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> 两颗人造地球卫星和的质量比，轨道半径之比，则它们的线速度之比 ______________，向心加速度之比 ______________，向心力之比 ______________。

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发布时间：2020-03-13

两颗人造地球卫星和的质量比，轨道半径之比，则它们的线速度之比，向心加速度之比，向心力之比 __。

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1 完形填空。 I hated math and was really bad at it when I was young, so I found others to allow me to copy their work. Even though they knew they were 1 me, there were lots of people who were glad to"help". In this way, I 2 a few tests. But one day something 3 happened. Our teacher changed our 4 for the exam and I was sitting beside a boy that I seldom 5 with before. As I could only answer a question or two, I had to turn to him 6 I didn"t want to have a sea of red crosses (叉号) in my paper. I signaled (示意) to him and managed to 7 his attention. When he asked me what I wanted, I 8 asked him for the answers. To my surprise, he 9 without any hesitation (犹豫). Of course, I was really 10 at his behavior and thought badly of him. After the test he 11 me, telling me that I could get good grades in math and that all I needed was to put more 12 into studying the subject. I was still 13 with him, but I couldn"t get his words out of my mind. From that day on, I began to 14 more time to my math. Slowly, the subject I 15 hated so much turned into such an interesting thing. I started to pass my math tests with my own 16 . Time passed and I was getting many As in my math even till my higher studies. Till today, I am still 17 to my friend who didn" t allow me to copy his work. He 18 if he provided me with the "help" during the test, there would be no 19 for me to shine. So let others shine and don" t ever rob (掠夺) others of their opportunity to show their 20 . ( )1. A. protecting ( )2. A. made up ( )3. A. amazing ( )4. A. seats ( )5. A. copied ( )6. A. when ( )7. A. give ( )8. A. finally ( )9. A. agreed ( )10. A. worried ( )11. A. came up to ( )12. A. interest ( )13. A. familiar ( )14. A. spend ( )15. A. sometimes ( )16. A. method ( )17. A. close ( )18. A. wondered ( )19. A. doubt ( )20. A. talent B. harming B. worked out B. important B. plans B. talked B. although B. turn B. immediately B. promised B. annoyed B. got along with B. effort B. patient B. devote B. seldom B. help B. thankful B. announced B. problem B. action C. cheating C. gave up C. strange C. papers C. debated C. until C. get C. actually C. refused C. troubled C got tired of C. strength C. honest C. add C. always C. ability C. kind C. knew C. chance C. style D. punishing D. got through D. terrible D. desks D. studied D. if D. take D. usually D. left D. surprised D. looked up to D. practice D. mad D. save D. never D. work D. connected D. found D. need D. idea
2 下列各组离子，在指定的环境中不能大量共存且一定会放出无色气体的是 [ ] 指定环境能够共存的离子 A. 能使pH试纸变红色的溶液 K +、Cl -、NO 3 -、NH 4 + B. 有SO 4 2-存在的无色透明溶液 Na +、K +、Cl -、Al 3+ C. c(H +)= 的溶液 Na +、S 2-、NO 3 -、CO 3 2- D. 常温下，c( H +)/c(OH -)=1×10 12的溶液 I -、Cl -、HCO 3 -、Na +
3 在坐标平面上直线l的方向向量 e =(- 4 5 ， 3 5 )，点O（0，0），A（1，-2）在l上的正射影分别为O 1、A 1，设 O1A1 =λ e ，则实数λ=（　　） A．2 B．-2 C． 11 5 D．- 11 5
4 It is in the hotel _____ he stayed last night ______ he lot his mobile phone. A．that ; that B．that ; where C．that; when D．where; that
5 下列离子或分子组中能大量共存且满足相应要求的是 [ ] 离子或分子要求 A. K +、NO 3 -、Cl -、HS - c(K +) B. Fe 3+、NO 3 -、SO 3 2-、Cl - 滴加盐酸立即有气体产生 C. NH 4 +、Al 3+、SO 4 2-、CH 3COOH 滴加NaOH溶液立即有气体产生 D. Na +、HCO 3 -、Mg 2+、SO 4 2- 滴加氨水有沉淀产生
6 （16分）小明同学乘坐杭温线“和谐号”动车组，发现车厢内有速率显示屏。当动车组在平直轨道上经历匀加速、匀速与再次匀加速运行期间，他记录了不同时刻的速率，部分数据列于表格中。已知动车组的总质量 M=2.0×10 5kg，假设动车组运动时受到的阻力是其重力的0.1倍，取 g=10m/s 2。在小明同学记录动车组速率这段时间内 t/s v/m·s-1 0 30 100 40 300 50 400 50 500 60 550 70 600 80 求：（1）动车组的加速度值；（2）动车组牵引力的最大值；（3）动车组位移的大小。
7 执行程序框图，如果输入的n是5，则输出的p是（　　） A．1 B．2 C．3 D．5
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9 阅读理解。 It was early afternoon and the harbor (海港) was quiet. Mr Bates, the keeper of the lighthouse (灯塔), went to the village. He left his daughters Rebecca and Abigail to look after the lighthouse. As Rebecca was about to prepare some water for the evening meal, she noticed a strange ship coming to the harbor. It stopped and lowered two little boats, which turned and started toward land: At that time people feared every ship they did not know, for the year was 1814 and America and Britain were at war. Rebecca and Abigail held their breath to see what these two boats would do. Closer and closer they came, until finally they entered the harbor. They were full of British soldiers! No help was to be seen. What could they do? How could they warn the town soldiers? They had no boat, and there would be no time to run to the village. Rebecca thought fast and then she had an idea. Calling to Abigail to follow, she ran to the room where the guns were stored. But instead of reaching for the guns, she took hold of the fife (军笛 ) and the drum(战鼓 ). Then the two young women ran along the wooded path to the shore (海岸). Hiding behind tall trees, they started to play the fife and the drum. Abigail beat out Roll Call. Rebecca joined in with Yankee Doodle. Soon Rebecca saw the boats had stopped! The girls went on playing. A moment later, a flag was raised on the warship-the signal for the boats to return. Once everyone was on board, the enemy ship set sail for the open sea. The British were fooled, and the" American Army of Two" won the day. 1. Why did Rebecca take the fife and the drum instead of the guns? A. She would leave the guns for the soldiers. B. She would welcome the British soldiers. C. She loved to play the fife and the drum. D. She wanted to frighten the British soldiers away. 2. The underlined part " American Army of Two" in the last paragraph probably refers to____. A. Rebecca and Abigail B. the two British boats C. the fife and the drum D. the two town soldiers 3. The British ship left the harbor because____. A. the British found the weather was too bad B. a lot of American ships came to stop the British C. the British thought the American soldiers were coming D. some of the British soldiers were killed by the American 4. Which of the following words could NOT be used to describe Rebecca and Abigail"s action?____ A. Brave. B. Honest. C. Clever. D. Great.
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两颗人造地球卫星 和 的质量比 ，轨道半径之比 ，则它们的线速度之比 ______________，向心加速度之比 ______________，向心力之比 ______________。

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两颗人造地球卫星和的质量比，轨道半径之比，则它们的线速度之比，向心加速度之比，向心力之比 __。