干扰电最常用的电流频率组合为A．2000Hz与2100HzB．3000Hz与3100HzC．4000Hz与4100HzD．5000Hz与510...

作者: rantiku 人气: - 评论: 0

问题干扰电最常用的电流频率组合为

选项 A．2000Hz与2100Hz B．3000Hz与3100Hz C．4000Hz与4100Hz D．5000Hz与5100Hz E．5500Hz与5600Hz

答案 C

解析

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