如图所示，重为100N的物体在水平方向上以1m/s的速度做匀速直线运动，弹簧秤求 发布时间：2017-07-18 16:47 │ 来源：www.tikuol.com 题型：问答题 问题： 如图所示，重为100N的物体在水平方向上以1m/s的速度做匀速直线运动，弹簧秤求数为5N（不计绳与滑轮的摩擦）．求：（1）作用在滑轮上的水平拉力F；（2）拉力F的功率．
题型：问答题 选择合适的词填空。 Today is Sunday. It's seven thirty _ l the morning. It's fine. Kate and her parents __2 _ the Ming Tombs. Kate's father is a doctor. 3 _ mother is a teacher. Now they're _ 4 _ a big bus. There are twenty-two people in it. Some are English, and _ 5 _ are American and Japanese. They look very _ 6 _. They are going to _ 7 __ the Ming Tombs, __8 _. There __9_ four Chinese on the bus. A young woman. __10 _ is a driver. A young man,he's a policeman. My father and I are going to the Ming Tombs, too.( ) 1. A. on ( ) 2. A. is going to ( ) 3. A. His ( ) 4. A. getting off ( ) 5. A. all ( ) 6. A. sad ( ) 7. A. visit ( ) 8. A. too ( ) 9. A. are ( ) 10. A. her B. in B. are going toB. Her B. getting in B. the others B. tired B. visits B. also B. am B. she C. at C. are going C. She's C. getting on C. some C. happy C. visited C. to C. is C. he 查看答案
题型：问答题 在森林古猿进化成人类的过程中，什么原因起了决定性的影响（ ）A．丛林变成了稀树草原即环境发生了变化B．类人猿有进化成人类的意愿C．黑猩猩厌倦了树栖的生活，想体验一下地面生活D．“露西少女”的影响 查看答案
