單項選擇題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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1.單項選擇題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

2.單項選擇題Drinking salt water will（）.

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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.

A.directly under the boom
B.moving away from the boom
C.stopped dead in the water
D.tied to the boom