1955年()面世,成为销量最大的助听器

A、炭精助听器;
B、半导体眼镜式助听器;
C、耳后式助听器;
D、集成电路助听器;
E、驻极体传声器助听器。
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正确答案:

C

答案解析:

暂无解析

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