基因“开关”涉及乙酰化作用，也就是将乙酰基群在染色质的DNA水平上引入到分子中，由此完成基因转录。
The genetic switch involves acetylation, the introduction of an acetyl group into a molecule at the DNA level of chromatin resulting in genetic transcription.
在此基础上研制了一台以开关电源作为高压直流电源、以氢闸流管作为主控开关的脉冲群电源。
HV EFT generator is developed, which adopts switching mode power supply as HV DC power supply and hydrogen thyratron as switch.
本文研究并设计了适用于抽油机变频群控系统这种特殊场合的开关电源，进行了大量实验并设计出样机。
This study develops the switching power for the public bus voltage of the pumping frequency group control system and carries out a large number of experiments.
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