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單項選擇題

0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.

A.vertical position
B.horizontal position
C.boom stop angle
D.minimum radius angle

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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

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