antenna directivity diagram 天线方向性图形...antenna directivity 天线指向性...directivity 指向性,方向性...vertical directivity 垂直指向性...horizontal directivity 水平指向性...directivity signal 择向讯号...directivity index 择向性指数...directivity of an antenna 天线的择向性...directivity factor 择向性因数...directivity gain 方向性增益...
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