在进行通信设备维护时，对于重点设备应特别采用（）方式。
A．事后维修
B．经济维修
C．预防维修
D．随机维修
参考答案：C
I am tired _____ the partner I have been working with; he is too hard a person______. [ ]
A. with; to get along with
B. from; to be got along with
C. of; to get along with
D. of; getting along with
正确地制定起重作业方案是为了达到安全起吊和（）的目的。
A、就位
B、操作
C、运输
