單項(xiàng)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
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1.單項(xiàng)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
2.單項(xiàng)選擇題0ur vessel’s propelled makes 120（）at full speed.
A.r.p.m
B.p.r.m
C.m.p.r
D.p.m.r
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