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單項(xiàng)選擇題

The collision bulkhead shall be of（）.

A.water-tight
B.air-tight
C.fire-tight
D.oil-tight

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單項(xiàng)選擇題

The deck control valve to be（）after being repaired.

A.moved and fitting again
B.removed and refitted
C.reproduced and put on again
D.return and attached again

單項(xiàng)選擇題

The disinfection of various compartment in a vesel by filling them with a gaseous agents to destroy rats ect.means（）.

A.fire drills
B.washing and cleaning
C.fumigation
D.quarantine

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