A.ships of above 200 GT to MARPOL
B.every ship of 400 GT and above
C.all ships
D.ships of more than 200 GT but less 400 GT
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A.ships of above 200 GT to MARPOL
B.every ship of 400 GT and above
C.all ships
D.ships of more than 200 GT but less 400 GT
A.one year
B.two years
C.four years
D.five years
A.one year
B.two years
C.four years
D.five years
A.fire fighting pump
B.the steering gear
C.life boat engine
D.the main engine
A.fire fighting pump
B.the steering gear
C.life boat engine
D.the main engine
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（） is not installed on the main switchboar.
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