短语词组短语symmetrical band -reject filter [电子]对称阻带滤波器digital band -reject filter 数字带阻滤波器band -reject crystal filter 带阻晶体滤波器comb adjustable band -reject filter 梳谱式阻带可变滤波器image reject band -pass filter 镜象抑制带通滤波器 返回 band-reject filter