摘要翻译~~英语大侠帮忙啊~！！

According to the experiment teaching of the high school physics the electromagnetism beats some necessity that the timer beats some frequency and can't adjust but makes the experiment appear an error margin to put forward changing electromagnetism to beat some timer to beat some frequency.BE beaten some timer work principle by the electromagnetism and set out, analyzed to carry out electromagnetism and beat some timer and beat some frequency an adjustable everyone a noodles piece, put forward wanting real Be operating an in operation realization and beating some frequency physically of adjustable not only need to provide purity of adjustable output frequency of exchanges low voltage, and want to carry out the proper frequency of vibration slice to correspond to adjust to output frequency for the power supply, attain a resonance.The vibration slice flaps to attain biggest then can make to beat to order clear, be advantageous to the processing of experiment data.

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