單項選擇題The center of volume of the immersed portion of the hull is called the().

A.center of buoyancy
B.center of floatation
C.center of gravity
D.tipping center


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1.單項選擇題The collision bulkhead shall be of().

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

2.單項選擇題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

3.單項選擇題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

5.單項選擇題The full utilization of berths can be achieved if().

A.ships arrive at random
B.cargo-handing time varies greatly
C.ships have to queue to get onto berths
D.ships do not have to wait to get onto berths