1·An analog signal is composed of four basic components: DC and AC magnitudes, frequency, and phase.
模拟信号由直流和交流分量、频率和相位四部分组成。
2·The control scheme and operating principle of a double closed-loop AC/DC power converter system are discussed by using physics.
从物理角度讨论了双闭环交/直流功率变换器系统的控制方案和工作原理。
3·The company manufactures power inverters necessary to convert the DC power generated by solar panels into the ac power required for most USES.
公司生产电力逆变器，把太阳能生成的直流电源转换为使用最多最需要的交流电源。
4·Some cutting-edge photovoltaic cells offer an even higher initial efficiency but fall behind when the DC power they produce is converted to grid-ready alternating current.
一些先进的光伏电池甚至可以提供更高的效率，但是由于要把直流电源转化为交流电，转换效率有所降低。
5·It would be far more efficient to power servers directly from a central DC supply.
而中央直流电源直接为服务器供能将大幅提高效率。
1·Man-made static magnetic fields are generated wherever DC currents are used, such as in electric trains or industrial processes such as aluminium production and in gas welding.
在使用直流电的地方即产生人为的静电磁场，例如在电车或诸如铝生产和气焊等工业操作程序中。
2·At present in the general of dc outside, according to the actual need to still can use cycle reversing current and pulse current.
目前除采用一般的直流电外，根据实际的需要还可采用周期换向电流及脉冲电流。
3·The cathode polarization: dc through electrode, the cathode potential deviating from the balance to the negative potential moves in the direction of the phenomenon.
阴极极化：直流电通过电极时，阴极电位偏离平衡电位向负的方向移动的现象。
4·About 84 GW of photovoltaics and concentrated solar power plants would be built by 2020. In parallel, the DC transmission system would be laid.
约能生产8400亿瓦的聚光太阳能发电及太阳能电池厂将会在2020年建成，与此同时直流电传输系统也有了一定基础。
5·The AC output must therefore be rectified, or changed to dc.
所以交流电必须整流为直流电。
1·Washington, DC, offers an example of a local programme with good intentions, high costs and limited efficacy.
华盛顿哥伦比亚特区在当地推行了一项计划，起到了表率作用。不过虽然出发点很好，但是耗资高且收效甚微。
2·On January 14th a Washington, DC, think-tank, the Migration Policy Institute (MPI), published a study of the impact of recession on migration in America.
一月十四日，华盛顿哥伦比亚特区的一个智囊机构移民政策协会（MPI）发表了一项经济衰退对美国移民影响的研究。
3·In December of last year, I was privileged to attend the White House Summit on Malaria in Washington, DC.
去年12月，我荣幸地在华盛顿哥伦比亚特区出席了白宫疟疾峰会。
4·At a ceremony in Washington, DC the evening of 16 June, the world's largest public health prize was presented to TDR Director Dr Robert Ridley.
在6月16日晚间于华盛顿哥伦比亚特区举行的颁奖仪式上，热带病研究和培训特别规划负责人Robert Ridley博士代表该规划接受了这项全球最大的公共卫生奖。