对极板振打力太大易引起（）并加速振打系统的机械损耗。

同义句转换。    

1. This road is 10 kilometers long. That road is 200 kilometers long.      

This road is                                       that one.    

2. Jim is the tallest boy in his class.      

Jim is                                                              in his class.    

3. The weather in China is not the same as that in Australia.      

The weather in China is                     that in Australia.    

4. There are more than fifty students in our class.      

There are       fifty students in our  class.    

5. Liu Li looks like her sister Liu Ying.      

Liu Li and Liu Ying