Warning: file_put_contents(/www/wwwroot/ppbbu/laei.cn/cache/b32a2a843f77b541fc225c60aac4c597.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/laei.cn/index.php on line 58 blind riser例句_blind riser英汉例句_blind riser双解例句_按摩法牛津词典
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. 比较五种冒口工艺方案，采用边暗冒口工艺生产球铁件转动环，提高了铸件质量和经济效益。