Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.<br>A:in boiler drums<br>B:in refrigerating plants<br>C:in starting air pipes<br>D:in air coolers

Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.
A:in boiler drums
B:in refrigerating plants
C:in starting air pipes
D:in air coolers

出自：海船船员证

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