题目：
干线传输方式主要有同轴电缆、（）、微波和光纤同轴电缆混合四种方式。
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
干线传输方式主要有同轴电缆、（）、微波和光纤同轴电缆混合四种方式。
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