Surface quenching hardness for different steel types are specified according to modules along with the depth of carbonized layer and the hardness match between meshed gears.是什么意思_Surface quenching hardness for different steel types are specified according to modules along with the depth of carbonized layer and the hardness match between meshed gears.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句