题目内容

（2009.12） Measures should be taken to avoid the negative effect (bring) ________ about by unfair competition.

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（2009.12）The following is a list of terms related to Security. After reading it, you are required to find the items equivalent to (与…等同) those given in Chinese in the table below.

The following is a list of terms related to Security. After reading it, you are required to find the items equivalent to (与…等同) those given in Chinese in the table below.

第一台PLC产生的时间是( )。

A. 1967年
B. 1968年
C. 1969年
D. 1970年

PLC控制系统能取代继电-接触器控制系统的( )部分

A. 整体
B. 主电路
C. 接触器
D. 控制电路