问题
单项选择题
During which condition should the operator of a pedestal crane shutdown operations?（）
A.Lightning
B.High winds
C.Fire aboard
D.All of the above
答案
参考答案：D
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During which condition should the operator of a pedestal crane shutdown operations?（）
A.Lightning
B.High winds
C.Fire aboard
D.All of the above
参考答案：D