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This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage value s.

摘 要：本系统以直流电压源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达0.1V，输出电压范围为0—9.9V，最大电流为330mA，并可由液晶屏显示实际输出电压值。系统有过流保护电路，当输出电流过大时功率管自动截至，而且有红色指示灯发出警报。

Abstract摘要:This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values.

论文摘要摘要：本系统以直流电压源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达0.1V，输出电压范围为0—9.9V，最大电流为330mA，并可由液晶屏显示实际输出电压值。系统有过流保护电路，当输出电流过大时功率管自动截至，而且有红色指示灯发出警报。

Keywords: regulated power supply of direct current; single2ch ip m icrocomputer, digital control Abstract:This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values.

数控直流稳压电源论文关键词：论文关键词：直流稳压电源单片机数字控制论文摘要：论文摘要：本系统以直流电压源为核心，AT89S52 单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达 0.1V，输出电压范围为 0—9.9V，最大电流为 330mA，并可由液晶屏显示实际输出电压值。

This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values.

论文摘要：本系统以直流电压源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达0.1V，输出电压范围为0—9.9V，最大电流为330mA，并可由液晶屏显示实际输出电压值。系统有过流保护电路，当输出电流过大时功率管自动截至，而且有红色指示灯发出警报。

This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values.

本系统以直流电压源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达0.1V，输出电压范围为0—9.9V，最大电流为330mA，并可由液晶屏显示实际输出电压值。系统有过流保护电路，当输出电流过大时功率管自动截至，而且有红色指示灯发出警报。

Graphics card or whether the time slot is too long and too much dust, as well as causing bad; display card chip if there were burnt and traces of cracking; lead to a black screen due to display card, the computer will power-on self test Fourth, there is a short-long "嘀嘀" voice prompt.

显示卡或插槽是否因使用时间太长而积尘太多，以至造成接触不良；显示卡上的芯片是否有烧焦、开裂的痕迹；因显示卡导致黑屏时，计算机开机自检时会有一短四长的&嘀嘀&声提示。

American production sales communications, environmental protection, digital, health care products category, the main varieties are: cell phone radiation shield, digital cameras, digital video camera, water filters, nutritional health products.

销售美国生产的通讯、环保、数码、保健类的产品，主要品种有：手机辐射防护屏，数码相机，数码摄像机，滤水器，营养保健品。

The XP3 Quest includes most features that mobile phone users expect, including a 2Mp digital camera with flash, built-in GPS navigation, Bluetooth support, Opera's mini web browser and a bright, seven-line colour display.

XP3 Quest拥有手机用户所期待的大多数功能，其中包括带闪光灯的200万像素摄像头、内置GPS导航、支持蓝牙、Opera迷你版网络浏览器、以及明亮的7线彩屏。

Many people thought that just fine, especially as it offered the luxury of a seven-inch screen.

大家都觉得够用了，况且它还带块奢侈的7寸屏。

On screen, Ennis's self-repression and self-loathing are given startling physical form: the awkward, almost hobbled quality of his gait, the constricted gestures, the way in which he barely opens his mouth when he talks all speak eloquently of a man who is tormented simply by being in his own body—by being himself.

萤屏上，Ennis 的那种自我压抑和自我憎恨被赋予了令人吃惊的外在形态：笨拙的几近蹒跚的步态，收敛的姿势，讲话时几乎张不开嘴；这些有说服力的特徵为我们描绘了一个为自己苦恼，被自己折磨的男人。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。