单选题If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.Alow compressionBfailure of the fuel pump to discharge fuelCincorrect timing of fuel pumpDturning gear being still on
单选题
If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.
A
low compression
B
failure of the fuel pump to discharge fuel
C
incorrect timing of fuel pump
D
turning gear being still on
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