单项选择题
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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相关考题
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单项选择题
Air reservoirs are designed, built and tested similarly to （）.
A.boiler drums
B.hot wells
C.condensers
D.evaporators -
单项选择题
The air reservoirs must have （） fitted to prevent rupture in the event of fire.
A.high pressure alarm
B.fire alarm
C.extinguishers
D.fusible plugs -
单项选择题
Before liquid can flow into a pump, the air in the suction line must be （） sufficiently to cause the liquid to flow into the suction chamber.
A.filled
B.evacuated
C.compressed
D.charged
