有关滤线栅的叙述，错误的是
A、单位距离内，铅条与其间距形成的线对数即栅密度E
暂无解析
ThissignsinAmericarepresents:
Whileonlyabout300workersreceivedisablementbenefitforindustrialdermatitiseveryyear,theremaybebetween15,000and60,000newcasesofthisconditioneveryyear.
Adultssometimesenvychildrenwhoplayallthetime____theythemselveshavetowork.rainorshine.
Doyouknowthereason____hewaslate?
Hereisapieceofpaper_____(在上面写着那本书的标题)TheArabianNights.
