单项选择题
A.the starting air supply is cut off and fuel is injected into the cylinders
B.the fuel feeding is cut off and the turning gear is put in
C.the starting air supply is cut off and turning gear is taken out
D.the electric blower is shut down and fuel is injected into the cylinders
单项选择题 When starting an engine, the compressed air enters the cylinder when the corresponding piston is in position of its（）
单项选择题 The starting air entering the cylinder begins when the piston（）
单项选择题 In the starting system, the automatic valve is controlled by（）, and the cylinder start valves are controlled by（）