“gray filter”的概念、定义、翻译、参考文献-科学参考

单词	gray filter
释义	gray filter [`gra ´fil·tǝr] See <<neutral-density filter>>
随便看	fixed capacitor fixed carbon fixed-charge problem fixed contact fixed cost fixed-cycle operation fixed disk fixed echo fixed-electrode method fixed emplacement fixed end fixed-end beam fixed-end column fixed end moment fixed-feed grinding fixed field fixed-field accelerator fixed-field method fixed fin fixed-focus lens fixed form coding fixed gun fixed-head disk fixed inductor fixed ion

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