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【单选题】
关于损耗和插入损耗，正确的描述是（）。
A.
损耗定义为反射波功率与入射波功率之比
B.
若负载匹配，无反射波功率，损耗为零
C.
插入损耗定义为入射波功率与传输功率之比
D.
插入损耗指的是电路损耗，不包含失配损耗
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