單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)選擇題Halon extinguishes fire primarily by（）.

A.cooling
B.smothering
C.shielding of radiant heat
D.breaking the chain reaction

4.單項(xiàng)選擇題Halon gas will decompose and may form very hazardous toxic fumes when discharged（）.

A.directly on flames
B.at room temperature
C.in an extremely cold climate
D.None of the above

5.單項(xiàng)選擇題Hand hold or straps on the underside of an inflatable are provided（）.

A.to right the raft if it capsizes
B.to carry the raft around on deck
C.for crewmen to hang on to
D.to hang the raft for drying