题目

关于单摆做简谐运动的过程中，下列说法中正确的是（） A . 在平衡位置摆球的速度和位移均达到最大值 B . 在最大位移处位移最大，而速度最小 C . 在平衡位置摆球速度最大 D . 摆球由最大位移到平衡位置运动时，速度变大，位移变小 答案：B,C,D书面表达 根据所给图示及短文内容，填上正确的单词完成短文． 　　My parents have a big farm outside the city. There are a lot of 1 and a tractor on it, like horses, ducks, chickens, cows and 2 3 . They 4 rice, wheat and corn in the 5 , They don’t use the animals to do farm work 6 7 . Today they use a tractor. It works 8 and better. I get home to 9 the animals after school. I think it is very 10 . The farm is also very beautiful. I like it a lot. How about you?