單項選擇題Generally, what is used to inflate life rafts?().

A.Non-toxic gas
B.oxygen
C.Hydrogen
D.Helium


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1.單項選擇題Generally, when lifting an inflatable life raft back aboard ship you would use the().

A.towing bridle
B.main weather cover
C.external lifelines
D.righting strap

2.單項選擇題Get the searchlight()for transiting the cancal at night.

A.turned off
B.already
C.almost
D.ready

3.單項選擇題GM cannot be used as an indicator of stability at all angles of inclination because().

A.M is not fixed at large angle
B.there is no M at large angles
C.G is not fixed at large angles
D.there is no G at large angles

4.單項選擇題Good anchorage may be obtained anywany, generally mud and sand, in this water area. Vessel may have().

A.good towing ground
B.good holding ground
C.good grabbing ground
D.good dragging ground

5.單項選擇題Halon extinguishes a fire by().

A.breaking the chain reaction
B.smothering the fire
C.cooling the fire
D.coating the fule with a nonflammable surface