频率为4000Hz的交流电用于治疗，属于何种电A．低频电B．中频电C．高频电D．超高频电E．干扰电

作者: rantiku 人气: - 评论: 0

问题频率为4000Hz的交流电用于治疗，属于何种电

选项 A．低频电 B．中频电 C．高频电 D．超高频电 E．干扰电

答案 B

解析

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