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【单选题】
高保真立体声音频信号的频率范围是（）
A.
50Hz～7000Hz
B.
200Hz～3400Hz
C.
300Hz～3000Hz
D.
50Hz～20000Hz
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Dear Mr. Smith: Thank you very much for your inquiry dated December 12, 2002. I am glad to tell you that we are an outstanding hi-tech company specializing in telephone facilities and are able to of...
A.
telephone recorders
B.
exclusive products
C.
telephone facilities
D.
mobile telephones