The timing of diesel engine air starting valves is controlled by（）<br>A:the air start valve timing gears and rods<br>B:a cylinder check valve<br>C:individual cams and valve gear<br>D:an air manifold poppet valve

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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