电业工作人员要经常使用各种电气安全工器具，不仅对完成工作任务起一定作用，而且对保护设

—Do you have _____ trouble finishing the work?

—The work is not so difficult as you think． We have finished it already．

A．much

B．any

C．some

D．no

--- What time are you planning to _____ tomorrow?

---It’s up to you.

A．set off

B．put off

C．turn off

D．take off

（）是指相邻波道或相近波道所带来的干扰.

A.码间干扰

B.交叉极化干扰

C.同频干扰

D.邻道干扰

根据工作特点的不同，机械可分为循环和连续动作两类。( )