单选题Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.Ain boiler drumsBin refrigerating plantsCin starting air pipesDin air coolers
单选题
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
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