题目:
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Monday, July l5th Great weather! It was 1 and hot all day. We went to a beautiful beach. We had great fun 2 in the water. In the afternoon. we went 3 . The shops were too crowded, so I didn't really enjoy it. Tuesday, July 16th Today it 4 , so we went to a museum. It was kind of boring. I found a small boy crying in the corner. He was 5 and I helped him find his father. That made me feel very 6 . I didn't have any money for taxi,so I walked 7 to the hotel. I was really tired. Wednesday, July 16th Today the weather was 8 , so we decided to play tennis. We 9 all the morning. It was really fun. We had Sichuan food for dinner. It was 10 . |
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答案:B题目分析:分析示意图,动滑轮共有3段绳子,克服A的摩擦力做功是有用功,所以机械效率,可得A受到摩擦力大小,选项B对物体运动速度为,绳子自由端移动速度为,所以拉力做功的功率,选项C错。在内物体移动...