Before entering the chain locker，you should（）.<br>A:have someone standing by<br>B:make sure there is sufficient air within the locker<br>C:de-energize the windlass<br>D:All of the above

Before entering the chain locker，you should（）.
A:have someone standing by
B:make sure there is sufficient air within the locker
C:de-energize the windlass
D:All of the above

出自：海船船员证

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