单项选择题
A.portable ventilation system B.flame safety lamp C.self-contained breathing apparatus D.gas mask
For small，first-degree burns the quickest method to rel...
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
Drinking salt water will（）.A.be safe if mixed with fres...
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
Chemical burns are caused by the skin coming in contact...
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
