单选题When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be （）Aan obstruction in an cylinderBwater accumulation in some engine cylindersClow starting air pressureDlow scavenge air pressure
单选题
When starting air is admitted, a diesel engine turns over very slowly without firingThe cause may be （）
A
an obstruction in an cylinder
B
water accumulation in some engine cylinders
C
low starting air pressure
D
low scavenge air pressure
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