常见例句雙語例句By comparison of five kinds of riser, the paper recomends the casting process design of side-blind riser which can assure the casting quality and reduce the casting cost.比較五種冒口工藝方案，採用邊暗冒口工藝生産球鉄件轉動環，提高了鑄件質量和經濟傚益。 返回 blind riser