0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.<br>A:vertical position<br>B:horizontal position<br>C:boom stop angle<br>D:minimum radius angle

0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.
A:vertical position
B:horizontal position
C:boom stop angle
D:minimum radius angle

出自：海船船员证

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