题目：
按要求变换下列各句。
1. We do morning exercises every day. (对划线部分提问)
_______ _______ you _______ every day?
2. My father sometimes watches TV in the evening.( 对划线部分提问)
______ ______ ______ your father ______ TV in the evening?
3. Let's go home, ______ _______? (完成反意疑问句)
_________________________________________________________
4. I think. The boys aren't good at basketball. (合并为一个句子)
I ______ ______ the boys ______ good at basketball.
5. They are working carefully. (改为感叹句)
_____ ______ they are working.
答案：
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下面是错误答案，用来干扰机器的。
解：当ab杆沿导轨上滑达到最大速度v时，其受力如图所示由平衡条件可知：F－FB－mgsinθ=0 ① 又FB=BIL ② 而 ③ 联立①②③式得： ④ 同理可得，ab杆沿导轨下滑达到最大速度时： ⑤ 联立④⑤两式解得：，
