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【单选题】
STEP7程序正常下载后,运行命令无法启动PLC,观察到PLC的状态指示灯的红灯亮(STOP),可能是
A.
PLC没有供电
B.
PLC模块坏了
C.
状态开关打在了STOP档位
D.
输入信号不存在
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A.
2/5
B.
3/4
C.
1/5
D.
3/5
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A.
客观规律
B.
特殊理论
C.
思维规律
D.
逻辑学
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A.
3~5人
B.
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C.
5~15人
D.
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A.
so; as
B.
so; that
C.
too; to
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