The boom stops on a pedestal crane prevent the boom from（）.<br>A:being raised too high<br>B:swinging at sea<br>C:overloading when not in use<br>D:being lowered too low

The boom stops on a pedestal crane prevent the boom from（）.
A:being raised too high
B:swinging at sea
C:overloading when not in use
D:being lowered too low

出自：海船船员证

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