单选题Before entering the chain locker，you should（）.Ahave someone standing byBmake sure there is sufficient air within the lockerCde-energize the windlassDAll of the above
单选题
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
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