单项选择题
Class B fires are best extinguished by smothering, i-e（）.
A.deprival of oxygen
B.removal of heat
C.spraying of water
D.injecting of soda-acid
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相关考题
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单项选择题
Class A fires are best extinguished by quenching or cooling with （）.
A.deprival of oxygen
B.a water spray
C.soda-acid
D.foam -
单项选择题
A fire starts when the following （） factors come together.
A.combustible material
B.ignition source
C.oxygen
D.A and B and C -
单项选择题
（） can be operated independently or locked together and operated as a twin-job cranes of double capacity.
A.Two derricks
B.A derrick and a crane
C.Two cranes
D.A crane and a winch
