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【单选题】
起重作业中突然停电，司机应首先＿。A.
锚定住起重机
B.
将所有控制器置零
C.
鸣铃或示警
D.
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举一反三
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A.
C
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D
C.
B
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D
E.
A
F.
A
G.
D
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B
I.
C
J.
C
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