Warning: file_put_contents(/www/wwwroot/ppbbu/52065.com/cache/dc8ba4babbf4c87cc54e2befa88b09bc.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/52065.com/index.php on line 55 blind riser例句_blind riser英汉例句_blind riser双解例句_伍贰汉英词典
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。