气门座要获得高的使用寿命就必须对其上、下倒角和工作面进行适当的修整。
Up chamfer, down chamfer and working face must be correctly dressed so that the valve seat can acquire a longer service life.
气门座要获得高的使用寿命就必须对其上、下倒角和工作面进行适当的修整。
Up chamfer, down chamfer and working face must be correctly dressed so that the valve seat can acquire a longer service life.
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