A.be safe if mixed with fresh water
B.prevent seasickness
C.dehydrate you
D.protect against heat cramps
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A.acids or alkalies
B.diesel oil
C.acids，but not alkalies
D.alkalies，but not acids
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
最新試題
Symptoms of heat stroke are（）.
The depth over a shallow patch，（）about 1．5 miles southeastward of Nanshan Tou lighthouse，reduces to 8 meters.
The danger associated with using carbon dioxide in an enclosed space is（）.
The maximum speed of lowering for a lifeboat on gravity davits is controlled by the（）.
The most effective first aid treatment for chemical burns is to immediately（）.
The object of plugging holes below the waterline on a ship should be to（）.
Sign(s) of respiratory arrest requiring artificial respiration is(are)（）.
The device that allows a floating ship to sway without bending the marine riser system is the（）.
The length of the steering oar in a lifeboat is（）.
In order for combustion to occur inside a piping system such as a vapor collection header in a marine emmission control system，there must be（）.