短語詞組短語welding with backing 襯墊銲;墊板銲welding flux backing 銲劑墊;銲劑墊英語;繙譯fusible welding backing 熔化性銲接背墊Xianghshan Welding Backing Factory 象山銲接襯墊廠welding with flux backing 銲劑墊銲Shanghai Taichang Welding Backing Factory 上海泰昌銲接襯墊廠backing welding 打底銲;底層銲接external backing welding 外銲根銲flux copper backing welding 銅板墊單麪潛弧銲 返回 weld backing