During which condition should the operator of a pedestal crane shutdown operations?（）<br>A:Lightning in the vicinity<br>B:An approaching squall line<br>C:A fire on the pier<br>D:All of the above

During which condition should the operator of a pedestal crane shutdown operations?（）
A:Lightning in the vicinity
B:An approaching squall line
C:A fire on the pier
D:All of the above

出自：海船船员证

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