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Deprecated: sha1(): Passing null to parameter #1 ($string) of type string is deprecated in /home/clients/2feb91a66b421fa2de710fdc95f51130/sites/herbocrate.ch/index.php on line 55 Propagation of Radiowaves 伝搬 無線 電波 電磁波 物陰へ伝わる電波、ローカル5Gで使う28GHz帯は、4.7GHz帯より