问答题

天线的主瓣宽度越大,则方向性越好,抗干扰性越强

【参考答案】

答案：错误。

解析：天线的主瓣宽度是指天线辐射图中主瓣（最强辐射方向）的宽度，通常用角度来表示......

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实验室质量手册的线性有效性由检验检测机构的（）保持

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