基本解释乾砂型英汉例句雙語例句Diseussion about the course during molding and easting of negative pressure dry-sand EPC has been expounded.本文針對負壓消失模鑄造的造型與澆注過程中存在的問題進行了研究。dry sand mold更多例句专业释义機械工程乾砂模法