常見例句雙語例句The invention discloses a mechanism for cleaning parting surfaces of an upper sand box and a lower sand box, which belongs to a producing line of castings.本發(fā)明屬于鑄造生產(chǎn)線上的一種上下砂箱分型面清理機(jī)構(gòu)。ip.com 返回 parting sand