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angular aperture
agric.	镜口角
automat.	天线角开度
nat.sc.	天线等张角
phys.	角孔径; 张角
shipb.	孔径张角
tech.	天线张角; 开角; 方向图宽度; 斜角孔; 张角 (天线)
telecom.	孔径角