A、A.increasing the quantity of starting air
B、B.increasing the lube oil pressure
C、C.heating the engine fuel supply
D、D.heating the engine coolant
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A、low lube oil temperature B、low starting air temperature C、air bubbles in the fuel oil system D、water in the starting air system
A、A.too low starting air pressure B、B.main starting valve closed C、C.neither A nor B D、D.A and B
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