單項(xiàng)選擇題A portable dry chemical fire extinguisher discharges by().

A.gravity when the extinguisher is turned upside down
B.pressure from a small CO2 cartridge on the extinguisher
C.air pressure from the hand pump attached to the extinguisher
D.pressure from the reaction when water is mixed with the chemical


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1.單項(xiàng)選擇題A portable foam (stored-pressure type) fire extinguisher would be most useful in combating a fire in().

A.generators
B.oil drums
C.the bridge
D.combustible metals

2.單項(xiàng)選擇題A position obtained by applying only your vessel’s coures and speed to a known position is a().

A.dead-reckoning position
B.fix B.estimated position
C.probable position
D.running fix

3.單項(xiàng)選擇題A right-handed propeller will cause the survival craft to().

A.walk the stern to starboard in reverse
B.walk the stern to port in reverse
C.run faster than a lefe-handed propeller
D.right itself if capsized

4.單項(xiàng)選擇題A sea anchor is().

A.a heavy anchor with an extra long line used to anchor in deep water
B.a cone shaped bag used to slow down the wind drift effect
C.a padeye to which the sea painter is made fast
D.made of wood if it is an approved type

5.單項(xiàng)選擇題A self-contained breathing apparatus is used to().

A.make underwater repairs to barges
B.determine if the air in a tank is safe for men
C.enter areas that may contain dangerous fumes or lack oxygen
D.resuacitate an unconscious person