單項(xiàng)選擇題

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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單項(xiàng)選擇題

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

單項(xiàng)選擇題

Drinking salt water will（）.

A.be safe if mixed with fresh water
B.prevent seasickness
C.dehydrate you
D.protect against heat cramps