单项选择题
Which statement about immersion suits is TRUE?（）
A.The primary color of the suit's exterior may be red，orange or yellow
B.The suit must，without assistance，turn an unconscious person's mouth clear of the water within 5 seconds
C.The suit is flameproof and provides protection to a wearer swimming in burning oil
D.The suit may be stored in a machinery space where the ambient temperature is 160°F
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A.An adjacent storeroom，containing spare parts
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C.An adjacent storeroom，containing mattresses and linen
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D.Dry chemical
