A.Condenses moisture
B.Provides overpressure protection
C.Purifies the air
D.Acts as an accumulator
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A.Stem
B.Pin
C.Box
D.Stand
A.An oxygen indicator
B.A combustible gas indicator
C.A combination combustible gas and oxygen indicator
D.A flame safety lamp
A.Carbon dioxide
B.Distilled water
C.Fresh water
D.Salt water
A.keep ports，doors，windows，and hatches closed
B.start engines immediately
C.ventilate before starting engine
D.None of the above
A.not
B.no
C.any
D.none
最新試題
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