短语词组短語direct unlubricated extrusion method 不加潤滑的正曏擠壓法direct extrusion molding 直接擠出成型Direct extrusion -ECAP 正擠壓cone -die direct extrusion 錐形模正擠壓extrusion direct 順擠;沖擠;嵈 返回 direct extrusion