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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
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【单选题】The human voice, like any sound produced by thrumming a stretched string, has a fundamental frequency. For voice, the centre of that frequency lies mostly below 300Hz depending on the speaker"s sex. I...
A.
reducing noise and amplifying higher-frequency
B.
cutting down noise and enhancing certain frequencies
C.
stressing higher frequencies and impairing lower ones
D.
weakening the frequency range between 300Hz and 6kHz
【单选题】The human voice, like any sound produced by thrumming a stretched string, has a fundamental frequency. For voice, the centre of that frequency lies mostly below 300Hz depending on the speaker"s sex. I...
A.
drawbacks and problems
B.
advantages and disadvantages
C.
development and advancement
D.
shortcomings and improvement
相关题目：
【单选题】The human voice, like any sound produced by thrumming a stretched string, has a fundamental frequency. For voice, the centre of that frequency lies mostly below 300Hz depending on the speaker"s sex. I...
A.
reducing noise and amplifying higher-frequency
B.
cutting down noise and enhancing certain frequencies
C.
stressing higher frequencies and impairing lower ones
D.
weakening the frequency range between 300Hz and 6kHz
【单选题】The human voice, like any sound produced by thrumming a stretched string, has a fundamental frequency. For voice, the centre of that frequency lies mostly below 300Hz depending on the speaker"s sex. I...
A.
drawbacks and problems
B.
advantages and disadvantages
C.
development and advancement
D.
shortcomings and improvement
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