The hardness and wear resistance of Al-16% Si alloy FGM de crease gradually from inside to outside of the specimens, and change in gradient.是什么意思_The hardness and wear resistance of Al-16% Si alloy FGM de crease gradually from inside to outside of the specimens, and change in gradient.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句