)^BZ,e ?A;RTM 美軍標(biāo)MIL-PRF-13830B中關(guān)于麻點(diǎn)的表述有一條如下: X $V_ 3.5.3.2 Maximum size digs. The permissible number of maximum size digs shallbe one per each 20mm of diameter or fraction thereof on any single optical surface. qE3Ud:j 請(qǐng)問(wèn)同行,or fraction thereof怎么理解?直徑小于20mm的怎么算? hxj\ 比如直徑10mm的鏡片要求40/20,要求最大麻點(diǎn)是20號(hào)的點(diǎn)子呢,還是分?jǐn)?shù)(10/20)*20號(hào)點(diǎn)子,還是其他?