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

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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

单项选择题

Changing rescuers while carrying out artificial respiration should be done（）.

A.without losing the rhythm of respiration
B.only with the help of two other people
C.by not stopping the respiration for more than 5 minutes
D.at ten-minute intervals