题目内容

通过记录脑电波并叠加形成的ERP发现，注意的效应在70-150ms就可以产生影响，这是______存在的证据。

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DNA是生命体的主要遗传物质。绝大多数生命体可以自主完成遗传物质的合成，试以大肠杆菌为例，总结DNA的复制一般过程，并分析DNA复制的基本规律。

Listen to the recording and fill in the missing blanks.I wish to take this opportunity to __(1) you on behalf of all my (2)_for your warm _(3)_ and incomparable (4)__. The past _(5)__ days in China have been truly (6) and enjoyable, and most (7)_. I hope that I will be your _(8)__ in my country in the near _(9)_. Here, I particularly want to pay _(10)_ to our Chinese (11)_ whose _(12) has made possible the (13)_ conclusion of the cooperative __(14)_. May I ask all of you present to join me in raising glasses to the _(15)_ and _(16)____ for our two companies?[音频]

直流电源多数是将交流电经过、、和后获得

电路用来将交流电压变换为单相脉动的直流电压