hard-alloy bit 中文意思是什麼
hard-alloy bit
解釋
硬合金鉆頭-
The application of the diamond and the hard alloy composite repair welding in strengthening the surface of the steel tooth rooler cone bit
金剛石和硬質合金復合堆焊在鋼齒鉆頭齒面強化中的應用
分享友人