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问题 问答题 简答题

一级维护作业是以什么为主？

答案

参考答案：

一级维护作业以清洁、润滑、紧固为主，并检查安全机件。

改错题
改错题。
     Cell phones can be see almost everywhere at        
                                                   
school now. Many teacher say that we students      
                                                   
should not used cell phones at school. But I think  
                                                   
it should be allowed to be used at school because  
                                                   
we want to get touch with our parents. Cell        
                                                   
phones can be used almost anywhere or at any       
                                                   
time. What more, cell phones can be great fun,     
                                                   
too. Besides make phone calls, we can also play    
                                                   
games and sent text messages to our friends by     
                                                   
cell phone. Don't you think of they are necessary? 
         
1._____  
         
2._____  
         
3._____  
         
4._____  
         
5._____  
         
6._____  
         
7._____  
         
8._____  
         
9._____  
         
10._____ 
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选择题

家蚕结茧后不食、不动时期是（  ）

A．卵

B．幼虫

C．蛹

D．成虫
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