The wooden plug inserted in the vent of a damaged tank should be removed if you are going to （）.<br>A:pump from the damaged tank<br>B:fight a fire<br>C:abandon ship<br>D:use the crossover system

The wooden plug inserted in the vent of a damaged tank should be removed if you are going to （）.
A:pump from the damaged tank
B:fight a fire
C:abandon ship
D:use the crossover system

出自：海船船员证

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