距500kV送电线边导线投影外20m处,在无雨、无风、无雾天气,频率0.5MHz的无线电干扰限值为()。A.53dB;B.55dB;C.58dB;...

作者: rantiku 人气: - 评论: 0
问题 距500kV送电线边导线投影外20m处,在无雨、无风、无雾天气,频率0.5MHz的无线电干扰限值为()。
选项 A.53dB; B.55dB; C.58dB; D.62dB。
答案 B
解析
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