- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
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
