After check the stems made by imported ferric stainless steel bars inside the 4-way reversing valve had cracks,The cracking stems was studied by Metallography,SEM and EDAX.是什么意思_After check the stems made by imported ferric stainless steel bars inside the 4-way reversing valve had cracks,The cracking stems was studied by Metallography,SEM and EDAX.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句