题目内容：
人耳最佳听闻频率为？
A.20-20000Hz
B.200-20000Hz
C.200-2000Hz
D.所有频率
参考答案：
选择题：人耳最佳听闻频率为？
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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