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單項選擇題

0n a vessel ,a C0₂ extinguisher is checked by（）.

A.reading the gage pressure
B.weighing the extinguisher
C.discharging a small amount of CO₂
D.seeing if the seal has been broken

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單項選擇題

0n a vessel,multipiying a load’s weight by the distance of the load’s center of gravity above the baseline results in a(n)（）.

A.transverse moment
B.vertical moment
C.righting moment
D.inclining moment

單項選擇題

0n cargo booms,preventers are（）.

A.auxiliary guys
B.extra fair leads
C.steel bands
D.stops

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