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【单选题】
在常用的降噪技术中，当输入主要为噪声时，言语可懂度指数(SⅡ)以降低增益为主，增益降低的限制在于输出不低于患者的听阈，言语可懂度指数(SⅡ)在( )后达到最佳设置。
A.
5s
B.
10s
C.
15s
D.
20s
E.
25s
参考答案：
参考解析：
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举一反三
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