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【单选题】
基频的平均范围在()。
A.
20-40Hz
B.
50-200Hz
C.
60-500Hz
D.
100-200Hz
E.
200-500Hz
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】Ladies and gentlemen, welcome to Dalian, a famous summer resort ( 避暑胜地 ) and one of the best tourist cities in China. With clear sky, green mountains, blue seas, fine beaches, clean streets and lovely...
A.
comes in the best season.
B.
is here to join more tourists
C.
may not stand the heat here.
D.
is traveling back home.