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The article makes a comparison among different types of bus, bus transmission signal and several familiar topologies of front-end converters and load-end converters. Finally, the half bridge converter with full-wave rectifier based on the high-frequency parallel-type AC bus bar is chosen as circuit structure and optimized. The working mode under different condition of the circuit is analyzed and a mathematical model is set up under continuous current mode. Simulation result is used as comparison.

通过对比不同类型的母线、母线传输信号以及各种常见的前端变换器拓扑和负载变换器拓扑，确定了基于并联型高频交流母线的半桥变换器加全波整流作为电路拓扑，并优化了电路的结构，分析了基于不同工作状态下的电路结构并建立电流连续模式的数学模型，并与软件仿真结果进行对比。

A new universal hybrid topology is brought forward. Two types multilevel inverter: equal DC voltage and DC voltage in geometric proportion is studied, besides this, simulation and experiments on SVPWM applied on cascaded H-bridge inverter is also studied.

提出了多电平逆变器的一种通用组合拓扑结构，针对这种拓扑结构重点，研究了直流侧电压相同及等比变化的两类级联拓扑以及级联H桥逆变器的矢量控制方法；并对级联H桥逆变器的矢量控制方法做了实验研究。

On current international abnormal bound is correctional implement or the heat of device --, ask slot from the lock, cultivate body to raise fight, glossal side is fixed and correctional implement reach invisible numerical control is not had ask slot correctional implement (the progress that Invisalign Appliance) reflected this tripartite range respectively.

当前国际上正畸界矫正器或装置的热点———自锁托槽、种植体支抗、舌侧固定矫正器及隐形数控无托槽矫正器分别反映了这三方面的进展。

GOM player is a very useful audio and video media player that has many of the most popular codecs built into it.

gom播放器是一个非常有用的音频和视频媒体播放器，即有许多最流行的编解码器建成投入扶贫开发。

Our factory is specialized in producing any of the following products: iodine sublimation tubes, connectors, Erlian ball on the wall, liquid convection experiments, and demonstration devices, U-type the highest minimum, capillarity, platinum and gold bars, Sheng liquid cylinder liquid internal pressure, small pressure, the nitrogen ball, scale straw, demonstration thermometer, water, electricity and gas, Newton tubes, a variety of test-tube funnel, chemical use test tubes, glass rods, Glue stick, glue the first dropper, all kinds of beaker , flask, measuring cup, graduated cylinder.

我厂专业生产下列产品：碘升华管，连通器，二连球，对器壁，液体对流实验器、演示器，U型最高最低，毛细现象，铂金丝棒，盛液筒，液体内部压强，微小压强计，二氧化氮球，刻度吸管，演示温度计，水电解气，牛顿管，各种试管漏斗，化学多用试管，玻棒，胶棒，胶头滴管，各种烧杯，烧瓶，量杯，量筒。

Graph coloring is a highly e?ective approach to globalregister allocation. In this paper, we should study priority-based register allocation, whichis a e?

常用的寄存器分配算法是被称作图染色的寄存器分配算法，本文所研究的基于优先级的寄存器分配就是图染色算法的一种。

In the gun-like design, manufacturing process, the design of a very wide range of gun-shaped device to optimize the system for retirement options, retirement system has the effect of the performance of two prominent, like a Barrett sniper rifle is the flat square muzzle retirement system, and another retirement system is a circular muzzle device.

在样枪的设计、制造过程中，设计了很多种形状的枪口制退器进行优化选择，其中制退效果表现突出的有两款，一款是仿巴雷特狙击步枪的扁方形枪口制退器，另一款是圆形枪口制退器。

Furthermore, it is clear that when carrier signal h=0, closed loop PWM DC-DC converters are not well-posed and when some condition is satisfied, closed loop PWM DC一DC converters with P controller are well-posed.

然后利用该结果对PWM型DC-DC降压变换器的适定性的研究表明当载波信号h=O时闭环PWM DC-DC 变换器总是不适定的，当载波信号h的参数和比例控制器的参数满足一定的条件时，比例控制的闭环PWM DC-DC变换器是适定的。

Meanwhile,the experiment is conducted and the air pressure inside the swirler and the influence of the swirler′s structure upon yarn hairiness are analyzed.

介绍旋流器的结构以及在环锭纺细纱机上的安装位置，实验并分析旋流器中的空气压力以及旋流器的结构对纱线毛羽的影响。

The results showed that the number of haustorium of P. striiformis in AQ and LB was 44.2/mm2 and 23.74/mm2 respectively. But there was no difference with the number of hastorium of the pathogen between XN (89.83/mm2) and MX (102.02/mm2), which indicated that XN had no resistance to haustorium.

结果表明：AQ和LB中条锈菌的吸器数目分别为44.2/mm2和23.74/mm2，两个品种对吸器均表现较强的抗性；XN中条锈菌吸器数目(89.83/mm2)与MX(102.02/mm2)无差异，未表现出明显的抗性。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。