筛: sedge的: 4次方是 The fourth power of 2 i ...有效: effective; valid; efficaciou ...面积: area筛的有效面: clear area of screen天线的有效面积: effective area of an antenna有效面积: active area; available area; capture area; clear area; clear opening; effective area; operating area; presented area; significant surface; strand area; useful area; valid surface瓣膜有效面积: effective valve area腹部有效面积: abdomen钢筋有效面积: effective area of reinforcement机厢有效面积: available car area机翼有效面积: effective wing area桨叶有效面积: effective blade area孔口有效面积: effective area of orifice炉排有效面积: active grate area; open grate area炉膛有效面积: active furnace area滤纸有效面积: effective filter area膜片有效面积: effective diaphragm area目标有效面积: presented target area人防有效面积: effective floor area for civil air defdnce筛子有效面积: screening surface水翼有效面积: effective surface of foil塔盘有效面积: active plate area天线有效面积: antenna effective area; capture area of antenna; effective antenna area相片有效面积: photograph effective area
