单选题Valves in the cylinder head of a diesel engine are opened by the direct action of the（）Aexhaust pressureBvalve spring pressureCrocker arm movementDwrist pin movement
单选题
Valves in the cylinder head of a diesel engine are opened by the direct action of the（）
A
exhaust pressure
B
valve spring pressure
C
rocker arm movement
D
wrist pin movement
参考解析
解析：
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