单选题The （）should be kept running for about half an hour after FWE.Acrankcase lubricating oil pumpBfuel oil pumpCair compressorDauxiliary blower
单选题
The （）should be kept running for about half an hour after FWE.
A
crankcase lubricating oil pump
B
fuel oil pump
C
air compressor
D
auxiliary blower
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