误', 'answer3' => '', 'answer4' => '', 'answer5' => '', 'answer6' => '', 'correct' => 'A', 'jiexi' => '', 'corrects' => '6', 'incorrects' => '1', 'wid' => '55074', 'dateline' => '1600742804', 'status' => '1', 'ztid' => '8', 'ztid1' => '0', 'ztid2' => '0', 'export' => '1', ), ); $expiration = '1754283955'; ?> 下列信道中,属于下行信道的是_答案与解析 - 5G通信
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