單項選擇題Before you begin administering artificial respiration, you should be sure the victim（）

A.is comfortable
B.is warm
C.is not bleeding
D.has a clear airway


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1.單項選擇題If liquid freon should come in with your skin, you should （）

A.wash with salt water
B.wash with sterile mineral oil
C.treat it like frostbite
D.treat it like any burn

2.單項選擇題If the effective bearing area has been reduced , remedial action should be taken（）

A.by more than 5 percent
B.by less than 10 percent
C.to 95 percent
D.to less than 90 percent