单项选择题
For use as protection from gas leaking from a refrigeration unit，each ship must be equipped with a（）.
A.portable ventilation system
B.flame safety lamp
C.self-contained breathing apparatus
D.gas mask
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相关考题
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单项选择题
For small，first-degree burns the quickest method to relieve pain is to（）.
A.immerse the burn in cold water
B.administer aspirin
C.apply petroleum jelly
D.apply a bandage to exclude air -
单项选择题
Drinking salt water will（）.
A.be safe if mixed with fresh water
B.prevent seasickness
C.dehydrate you
D.protect against heat cramps -
单项选择题
Chemical burns are caused by the skin coming in contact with（）.
A.acids or alkalies
B.diesel oil
C.acids，but not alkalies
D.alkalies，but not acids
