A.acids or alkalies
B.diesel oil
C.acids，but not alkalies
D.alkalies，but not acids
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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
A.directly under the boom
B.moving away from the boom
C.stopped dead in the water
D.tied to the boom
A.hoist man
B.limit switch
C.brake handle
D.preventer bar
A.is
B.is to be
C.will be
D.being
A.with puncture wounds
B.when all other means have failed
C.when the victim is unconscious
D.to prevent bleeding from minor wounds
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The most effective first aid treatment for chemical burns is to immediately（）.
The depth over a shallow patch，（）about 1．5 miles southeastward of Nanshan Tou lighthouse，reduces to 8 meters.
Sign(s) of respiratory arrest requiring artificial respiration is(are)（）.
The minimum amount of lifesaving equipment required aboard an 85-foot uninspected towing vessel consists of（）.
Lifeboat hatchets should be（）.
The first treatment given to a person overcome by benzene vapor should be to（）.
The backup system on an electric start survival craft is a（）.
Number 3 lifeboat would be（）.
Limit switches（）.
The maximum speed of lowering for a lifeboat on gravity davits is controlled by the（）.