不定项选择

更换转数计数器电池应该在关闭总电源的方式下进行。

A．错误
B．正确

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单项选择题

4.
A、It is suffering a great deal from the incident.
B、It is helping the police with the investigation.
C、It is bringing the case to the local district court.
D、It is offering a big reward to anyone who helps.

在FX系列PLC中主控指令是CJ。（）

答案：错误