单选题The engine will fail to start unless （）.Athe pressure of the starting air is high enoughBthere is enough air in the air reservoirsCthe air is supplied into the cylinders in the appropriate sequenceDall of the above
单选题
The engine will fail to start unless （）.
A
the pressure of the starting air is high enough
B
there is enough air in the air reservoirs
C
the air is supplied into the cylinders in the appropriate sequence
D
all of the above
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