常見(jiàn)例句雙語(yǔ)例句In addition, the effect is introduced that castiron centrifugal coated anticorrosive material is used in coal water with alum.介紹了鑄鉄離心泵防腐塗層在煤鑛礬水中的應(yīng)用傚果。 返回 alum coal