单项选择题

Dry chemical fire extinguishers are effective on which type(s) of fire?（）

A.Burning oil
B.Electrical
C.Paint
D.All of the above

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单项选择题

Dry chemical extinguishers extinguish class B fires to the greatest extent by（）.

A.cooling
B.smothering
C.oxygen dilution
D.breaking the chain reaction

单项选择题

Convection spreads a fire by（）.

A.heated gases flowing through ventilation systems
B.the transfer of heat across an unobstructed space
C.burning liquids flowing into another space
D.transmitting the heat of a fire through the ship's metal

单项选择题

Controls for a fixed carbon dioxide system shall be mounted（）.

A.directly outside the space protected by the system
B.as near the gas cylinders as possible
C.in the pilothouse
D.on the main deck near the bow