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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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单选题Explosions do occur （） caused by the ignition of oil or vapour gaining access from compressors or defective engine starting valves.A
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in air coolers
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