题目
A.频率
B.周期
C.波长
D.振幅
第1题
A.圆频率是频率的6.28倍; The circular frequency is 6.28 times the frequency;
B.圆频率是频率的3.14倍; The circular frequency is 3.14 times the frequency;
C.频率是圆频率的6.28倍; The frequency is 6.28 times the circular frequency;
D.频率是圆频率的3.14倍; The frequency is 3.14 times the circular frequency;
第9题
A.10kHz
B.20kHz
C.10MHz
D.20MHz
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