The external flotation bladder of an immersion suit should be inflated（）.<br>A:only after two hours in the water<br>B:only after four hours in the water<br>C:before entry into the water<br>D:upon entry into the water

The external flotation bladder of an immersion suit should be inflated（）.
A:only after two hours in the water
B:only after four hours in the water
C:before entry into the water
D:upon entry into the water

出自：海船船员证

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