开关

In this paper, to development tendency of electrical source of alternating stable voltage, working principle of switch mutual complementary alternating regulator are proposed and analyzed .

本文针对国内交流稳压电源的发展趋势，提出并分析了开关互补式交流稳压器的工作原理。

It contains quadratic photosynthetic chamber and columned soil fixing body, wherein soil fixing body of canopy leaf chamber bottom set with knob basal portion being corrugation notch, capable of easy inserting amboceptor in soil to form inclosed canopy leaf chamber, amboceptor upper port inosculation with photosynthetic chamber lower wall round opening to make canopy leaf chamber intracavity forming one integral, photosynthetic chamber upper wall sealed by two side glue and photosynthetic film to ensure photosynthetic chamber steady light permeability, photosynthetic chamber sidewall installed one small size fan controlled by external battery and switch, fan capable of rapid making canopy leaf chamber gaseous reaching equalization.

本发明涉及一种用于测定植物冠层群体光合作用的冠层叶室，由正方形的光合室和圆柱状的土壤固定体两部分结合而成，冠层叶室下部土壤固定体设有把手，基部为波纹状切口，可以很容易地把固定体插入土壤中形成密闭的冠层叶室，固定体上口与光合室底壁的圆形开口吻合，使冠层叶室的内腔形成一个整体；光合室顶壁用双面胶和光合薄膜密封，以保证光合室稳定的透光性能；光合室侧壁内安装一个小型风扇，由装在侧壁外的电池和开关控制，风扇可使冠层叶室内的气体迅速达到平衡。

Focused on many problems existing in pressure control system of drilling pipe friction welding,such as high failure rate and poor amenability,the basic principles of friction welding and electro-hydraulic proportional technique were briefly described.

针对焊接钻杆连续驱动摩擦焊机采用开关阀组成压力控制系统存在故障几率高、可控性差等问题，将电液比例控制技术应用在摩擦焊压力控制中，实现了摩擦焊轴向压力闭环控制、滑台进给速度的开环控制；可对摩擦焊机主轴速度、轴向压力、轴向缩短量、主电机电流、油温等进行实时检测。

One of the key factors of affecting fidelity of switching power amplifier is control technique.

控制技术是影响开关功率放大器保真度的关键因素之一。

A high-speed electronic switch is used to present the analog information signal of each channel, taken in turn, to the codec.

6 ，一个高速电子开关是用来目前模拟信息信号的每个通道，采取反过来，以编解码器。

A high-speed electronic switch (12a) is used to present the analog information signal of each channel, taken in turn (12b), to the codec.

一个高速的电子开关被用来将每一话路的模拟信号依次地送往编、译码器。

The Swithched-Current circuit is a new technique for analog sampled data processing.

开关电流技术是一种新的模拟抽样数据处理技术。

The system developed by the author consists of a 7-holes pitot tube, a stepping motor, seven pressure transducers, an analogue amplifier, a computer data acquisition card, a switch voltage output circuit and a data processing system.

本文研制了一种七孔探针三维自动测速系统，该系统由球形七孔探针、异步步进电机、压力传感器、模拟放大器、计算机数据采集、开关量输出及数据处理系统组成。

At first the paper has introduced the power amplifier, including its classification, its main technical specification, several kinds of common enlargement circuitry, and analyzed the switch power amplifier principle of work as well as its analysis situs expansion.

本篇论文首先对功率放大器进行了介绍，其中包括它的分类，它的主要技术指标，几种常见的放大电路原理，分析了开关功率放大器的工作原理以及其拓扑扩展。

The results show that spectrum switch is appearing in the vicinity of critical diffraction angle c.

结果表明，在临界衍射角θc附近光谱开关出现。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷