题目内容

可编程控制器的主要硬件结构有（）、（）、（）、（）、（）等。

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S7-1200硬件部分主要由CPU模块、信号板、信号模块、通信模块、精简系列面板等组

A. 对
B. 错

The __________ are paid to do all the work on the ship.

A. partner
B. crew
C. monitor
D. majority

__________ you understand this rule, you'll have no further difficulty.

A. Once
B. Although
C. While
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I shall __________ you by telephone on Friday.

A. contact
B. connect
C. complain
D. communicate