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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1.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

2.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

3.單項選擇題0n cargo booms,preventers are（）.

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

4.單項選擇題0ne of the limitations of foam as an extinguishing agent is that foam（）.

A.cannot be made with salt water
B.is heavierthan oil and sinks below its surface
C.is corrosive and to fire fighters
D.conducts electricity

5.單項選擇題0ne of your crew members falls overboard from the starboard side. You should immediateiy（）.

A.apply left rudder
B.throw the crew a life preserver
C.begin backing your engines
D.position your vessel to windward and begin recovery