The boom indicator on a crane will indicate the（）.<br>A:length of the boom<br>B:angle of the boom<br>C:lifting capacity of the boom<br>D:direction of the boom

The boom indicator on a crane will indicate the（）.
A:length of the boom
B:angle of the boom
C:lifting capacity of the boom
D:direction of the boom

出自：海船船员证

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