单选题The timing of diesel engine air starting valves is controlled by（）Athe air start valve timing gears and rodsBa cylinder check valveCindividual cams and valve gearDan air manifold poppet valve
单选题
The timing of diesel engine air starting valves is controlled by（）
A
the air start valve timing gears and rods
B
a cylinder check valve
C
individual cams and valve gear
D
an air manifold poppet valve
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