【名词&注释】
二氧化碳、灭火剂(fire extinguishing agent)
[单选题]After a ship enters service it is_____for the main bus-bar to be made dead
A. usually
B. commonly
C. exceptional
D. unavoidably
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举一反三：
[单选题]If the flame from combustion in the cylinder of a four-stroke engine past the piston into the space below, the accumulation of flammable mixture would be ignited, thus resulting in _____.
A. the crankcase explosion
B. lifting of the cylinder safety valve
C. a scavenge fire
D. opening of the manhole
[单选题]下列说法错误的是：_______。
A. 甲类火的最佳灭火剂是水。
B. 油轮油舱着火最好用二氧化碳扑灭。
C. 乙炔气着火可用干粉扑灭。
D. 7150灭火剂可以扑灭金属火。
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