effective way有效方法
effectiveadj.有效的;生效的;实际的
effective picture area有效图像面积
effective scale length有效刻度长
effective orifice area有效孔区
effective machine time有效工作时间
effective stack height烟囱有效高度
effective width method有效宽度法
effective earth radius有效地球半径
effective current flow有效电流
effective intervention有效干预
effective-pure state有效纯态