focus drum是什么意思


中文翻译聚焦筒

网络释义

1)focus drum,聚焦筒2)focusing barrel,聚焦镜筒3)concentration cylinder,聚焦圆筒4)Cylindrical electrode focusing,圆筒电极聚焦5)barrel-type point focusing monochromator,筒型单色点聚焦器6)focus-defocus,聚焦-失焦

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