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【单选题】
PLC的开关量输入端可以接（ ）、行程开关、传感器等。A.
选择开关
B.
继电器
C.
指示灯
D.
接触器
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举一反三
【简答题】The ( )of the food supplies in the earthquake area began two days ago.
【单选题】Food supplies in the flood-stricken area ______. We must act immediately before there’s nothing left.
A.
have run out
B.
are running out
C.
have been run out
D.
are being run out
【单选题】Food supplies in the flood-stricken area . We must act immediately before there’s left.
A.
have run out
B.
are running out
C.
have been run out
D.
are being run out
【单选题】Food supplies in the floodstricken area ________. We must act immediately before there's none left. [ ]
A.
have run out
B.
are running out
C.
have been run out
D.
are being run out
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