单选题Which is TRUE concerning immersion suits and their use?（）AOnly a light layer of clothing may be worn underneathBThey provide sufficient flotation to do away with the necessity of wearing a life jacketCThey should be tight fittingDA puncture in the suit will not appreciably reduce its value
单选题
Which is TRUE concerning immersion suits and their use?（）
A
Only a light layer of clothing may be worn underneath
B
They provide sufficient flotation to do away with the necessity of wearing a life jacket
C
They should be tight fitting
D
A puncture in the suit will not appreciably reduce its value
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