closure head 顶盖 ; 封头顶盖 ; 外壳顶盖 ; 封头
closure head penetration 封头贯穿件
vessel closure head support skirt 压力容器封头支承裙筒
Splice closure welding head 拼接封头的焊封
top vessel closure head 顶容器密合
closure head lift 顶盖吊具
closure head assembly 封头组合体
closure head insulation 顶盖保温层
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