翻译：Alternating Current

Who invented the alternating fields method?

The function of direct current regulated power supply is to input an alternating current power of 220volts, so that it can output __________.( ) A: alternating current 200 volts voltage B: direct current 24 volts voltage C: direct current 200 volts voltage D: alternating current 24 volts voltage

Pointed arch, alternating high and low sections of a wall are typical ________ characteristics.

The backbone of a DNA molecule is: ( ) A: made up of sugars B: made up of nitrogenous bases C: made up of phosphate groups D: made up of alternating phosphate and sugar groups E: made up of alternating sugars and nitrogenous base

To examine 1 thing thoroughly, and then start the other. A: alternating (point-by-point) B: block (subject -by subject)

The<br/>backbone of a DNA molecule is () A: made<br/>up of sugars B: made<br/>up of nitrogenous bases C: made<br/>up of phosphate D: made<br/>up of alternating phosphate and sugar groups E: made<br/>up of alternating sugars and nitrogenous base

智慧职教: 交流发电机的（）是产生交流电动势的？ What produces the alternating current electromotive force?

Alternating current as a source of power has certain advantages over direct current. 前后两个下划线介词短语分别充当_______。

在电力电子变流技术中，将交流（Alternating Cur...rent，简称DC）的电力变换技术称之为