单选题The external flotation bladder of an immersion suit should be inflated（）.Aonly after two hours in the waterBonly after four hours in the waterCbefore entry into the waterDupon entry into the water
单选题
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
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