根据要求进行句型转换    

1. I study English by asking the teachers for help. (对画线部分提问)      

                                 you study English?    

2. It's very hard.I can't understand the words. (将两句合为一句)      

    It's _______ hard _______ me _______ understand the words.    

3. He thinks that watching English movies is a good way to learn English. (同义句转换)      

    He thinks     ____  is a good way to leam English _______ _______ English movies.    

4. It helped a lot. (改为否定句)      

    It      ____  help ________.

5. I don't know how I can learn English well. (同义句转换)     

    I don't know _______                              English well.

交流电气装置和设施下列金属部分哪项可不接地？（）

A.装有避雷线的架空线路杆塔

B.装在配电线路杆塔上的开关设备、电容器等电气设备

C.标称电压220V及以下的蓄电池室内的支架

D.铠装控制电缆的外皮