单项选择题
Foam-type portable fire extinguishers are most useful in combating fires involving（）.
A.solid materials such as wood or bales of fiber
B.flammable liquids
C.electrical equipment
D.metallic solids
相关考题
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单项选择题
Fittings used for towing must be（）.
A.Coast Guard approved
B.stamped with maximum working loads
C.securely fastened
D.positioned exactly at the bow of the towed vessel -
单项选择题
Fire protection regulations for towing vessels require any fuel line subject to internal head pressure from fuel in the tank to（）.
A.be fitted with a positive fuel shut-off valve located at the tank
B.have a shut-off valve at the top of the tank
C.have a gate valve easily accessible in the space where the tank is located
D.have a drain cock at the lowest point in the fuel line -
单项选择题
Fire protection regulations for towing vessels require all crew members to know how to perform each of these tasks EXCEPT（）.
A.start the mechanical ventilation system for the engine room
B.operate the fuel shut-off for the engine room
C.operate all fire extinguishing equipment aboard the vessel on board the vessel，including starting the fire pump
D.All of the above
