單項(xiàng)選擇題Dry chemical extinguishers extinguish class B fires to the greatest extent by().

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


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題Control of flooding should be addressed().

A.first
B.following control of fire
C.following restoration of vital services
D.only if a threat exists

4.單項(xiàng)選擇題Control of fire on a ship should be addressed().

A.immediately after restoring vital services
B.immediately
C.following control of flooding
D.following establishment of fire boundaries

5.單項(xiàng)選擇題Combustible gas indicators measure the presence of combustible gas as a percentage of the().

A.flash point
B.upper explosive limit
C.lower explosive limit
D.fire point