句型转换。

1. "Could I copy your homework?" He asked me. (改为间接引语)

     He asked me                                           copy              homework.

2. The girl was shopping when the accident happened. (对划线部分提问) 

                               the girl              when the accident happened?

3. We don't know when we will leave the city. (改为同义句)

    We don't know                                        the city.

4. There will be less pollution in the future. (改为反意疑问句)

    There will be less pollution in the future,                           ?

5. I think the dress is in style. (改为否定句)

    I              think the dress              in style.

6. His sister is running very fast. (改为感叹句)

                               his sister is running!

根据下图所示的传动系统，说出V轴可获得几种转速并计算出V轴的最高和最低转速。