题目内容

In the simple harmonic motion, the number of cycles per second is called the frequency.

A. 对
B. 错

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Phase reflects the oscillatory state--vibrating position and direction.

A. 对
B. 错

The simple harmonic vibration and simple harmonic wave are different.

A. 对
B. 错

Some source of disturbance & elastic mediums are needed for the travel of mechanical waves.

A. 对
B. 错

Some source of disturbance & elastic mediums are needed for the travel of waves.

A. 对
B. 错

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