The boom stops are installed on an offshore crane to（）.<br>A:prevent the boom from being raised too high<br>B:prevent the boom from swinging<br>C:support the boom when not in use<br>D:prevent the boom from being lowered

The boom stops are installed on an offshore crane to（）.
A:prevent the boom from being raised too high
B:prevent the boom from swinging
C:support the boom when not in use
D:prevent the boom from being lowered

出自：海船船员证

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