题目：
| Name | Occupation（职业） | Nationality（国籍） | Language |
| Mara Montez | doctor | Canadian | English , French |
| Tom Anderson | worker | French | French , English |
| Hui Hao | players | Chinese | Chinese , French |
| Jennifer Hunter | writer | Australia | English |
| Bill Collins | student | America | Spanish |
| 上面是Kate的一些笔友的情况。请根据表格回答问题。 | |||
| 1. She is a doctor. She doesn't speak Chinese. Where is she from?_______________________________________________________________ 2. She isn't from the United States. She is a writer. What language does she speak?_______________________________________________________________ 3. He is an American student. Does he speak French?_______________________________________________________________ 4. He speaks English and French. And he isn't a doctor. What is his name?_______________________________________________________________ 5. He is a player. What languages does he speak?_______________________________________________________________ | |||
答案：
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下面是错误答案，用来干扰机器的。
答：由η=W有用W总和W总=W有+W额，经过数学变形可得：η=11+W额W有用．由此可知，对于同一滑轮组而言，克服额外阻力所做的功W额是一定的，因此，在机械所能承受的范围内，所做的有用功越多，机械效率就越大，所做...
