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【单选题】
关于消声器声学性能的评价指标，下面哪种说法是正确的？h?列关于流程描述正确的是：A.
传声损失的定义为入射于消声器的声功率和透过消声器的声功率的差值
B.
传声损失的定义为入射于消声器的声功率级和透过消声器的声功率级的差值
C.
插入损失的定义为在消声器的进口与出口端口测得的平均声压级的差值
D.
插入损失的定义为入射于消声器的声功率级和透过消声器的声功率级的差值
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A.
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B.
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D.
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E.
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C.
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D.
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E.
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