振动三要素中的圆频率与频率有什么关系？ What is the relation between the circular frequency
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振动三要素中的圆频率与频率有什么关系？ What is the relation between the circular frequency and frequency in the three elements of vibration？
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;
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