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今天是:

perforated head是什么意思


中文翻译有孔封头

网络释义

1)perforated head,有孔封头2)improved header with punched baffle,孔板封头3)spherical-zone shell,开孔封头4)blank head,无孔封头5)opening in head,封头开孔6)Pore stuffed with organic coating,有机封孔