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Cascade multilevel converter is made up of modules. It can be normally divided into two kinds: one with same modules and the other with different modules. This paper analyzes the relationship among the maximum number of output voltage level, the number of cascaded modules, and the input voltage ratio and THD of output voltage in different kinds of cascade multilevel converter. Then, some guidelines for making up cascade multilevel converter are given.

级联型多电平变换器类似于积木化的结构，本文按模块单元的结构形式，将级联型多电平变换器分为相同单元和不同单元两类，以输出最大电平数为目标，系统地分析模块单元个数与最大输出电平数、输入直流电压与最大输出电平数、以及输出电平数与谐波畸变率之间的关系，从中归纳得到构造级联型多电平变换器的指导原则。

Castor seeds were degreased with 3 kinds of solvents including petroleum ether, aether and methylene chloride, and ricins were extracted from the defatted castor cake with acetic acid solution. And the rat-killing activities of 3 kinds of ricins were compared in the rat-killing activity test.

方法］用石油醚、乙醚、二氯甲烷3种溶剂分别对蓖麻粗籽进行脱脂后，用醋酸水溶液从脱脂的蓖麻饼中提取蓖麻毒蛋白，通过杀鼠活性试验比较3种蓖麻粗毒蛋白的杀鼠活性。

Japanese Komatsu, Hitachi, Kato, Sumitomo, Carter, the United States and South Korea's Hyundai, Daewoo, Samsung, various kinds of imported excavator seal the fuel tank, the center seal, crankshaft oil seals before and after, and services for major projects in the fuel tank of the domestic plants, for provide users with a variety of piston oil seal (SPGO, SPGW, SPG portfolio, such as seals), piston rod seal (SPNO, IDI, HBY, etc.), a variety of materials to support Central (A phenolic cloth, filled PTFE composites, POM, etc.), V-type combination of seals, all kinds of O-ring, PTFE block films, a variety of automotive oil seals.

提供日本小松、日立、加藤、住友、美国卡特及韩国现代、大宇、三星、各种进口挖掘机油缸密封件、中心油封、曲轴前后油封，并服务于国内各大工程油缸厂，为用户提供各种活塞油封（SPGO、SPGW、SPG等组合密封）、活塞杆密封（SPNO、IDI、HBY等）、各种材料支撑环（酚醛甲布、填充复合聚四氟乙烯、聚甲醛等），V型组合密封圈，各种O型圈、聚四氟乙烯挡片、各种汽车用油封。

Results Eight kinds of trace elements were found in marten's heart.The magnesium content was 685.31 mg/kg and it was the highest among the detected trace elements.Nine kinds of elements were found in chicken's heart,but the potassium content was 11 829.7 mg/kg and the highest in it.

JP3结果：貂心中含有8种微量元素，其中镁含量最高，为685.31 mg/kg；鸡心中含有9种微量元素，其中钾含量最高，为11 829.7 mg/g。

Was established in September 1999, in Yongjia County of Wenzhou City Oubei Town-Ao industrial areas, mainly engaged in production of various kinds of buttons and accessories, all kinds of metal hardware and other metal products, and various types of Christmas bells Exquisite jewelry.

成达金属饰品有限公司成立于1999年9月，位于温州市永嘉县瓯北镇珠岙工业区，主要从事生产各类钮扣和辅料、各类金属小五金与其它金属制品、圣诞铃铛与各类精美饰品。

Professional operating various lathes, drilling machine, combination machine tool, milling machine, boring machine, planer, slotting machine, grinding machine, broaching machine, sawing machine, machine tool accessories, machine tool accessories, machine tool hydraulic parts, pneumatic components, ball screw, friction plate, chuck , card claw, various fixtures, cooling pumps, gear pumps, vane pump, variable pump, all kinds of machine friction plate, oil cups, glib, butter cups, oil cups, flat belts, ribbed belts, timing belt, the center frame, with the tool carrier, dividing head, legislative milling head, all kinds of commonly used air hammer parts, forging machine tool parts, punch parts, adjust the various specifications Sizing Block, V-frame, flat panel.

专业经营各种车床、钻床、组合机床、铣床、镗床、刨床、插床、磨床、拉床、锯床，机床配件、机床附件、机床液压件、气动元件、滚珠丝杆、摩擦片、卡盘、卡爪、各种夹具、冷却油泵、齿轮泵、叶片泵、变量泵、各种机床摩擦片、油杯、油嘴、黄油杯、机油杯、平皮带、多楔带、同步带、中心架、跟刀架、分度头、立铣头，各种气锤常用件、锻压机床配件、冲床配件、各种规格调整垫铁、V型架、平板。

China's "Highway Engineering Technical Standards" will be divided into high-level road according to technical quality, sub-senior, middle and low-level four kinds, all kinds of road surface types are as follows: Senior Pavement - asphalt concrete pavement, cement concrete pavement, plant mix asphalt crushed stone pavement, stone pavement of rocks or neat; second high-level road surface - asphalt penetration-style pieces, gravel road, asphalt road debris, gravel road, asphalt road surface, Treatment, semi-neat stone pavement; middle road - broken, gravel (size distribution, or clay-bound) road surface, irregular stone pavement, other granular surface; low road - aggregates stabilized soil surface, and other local materials, reinforcement or improvement of soil surface.

中国《公路工程技术标准》将路面按技术品质分为高级、次高级、中级和低级四种，各种路面的面层类型如下：高级路面——沥青混凝土路面，水泥混凝土路面，厂拌沥青碎石路面，整齐石块或条石路面；次高级路面——沥青贯入式碎、砾石路面，路拌沥青碎、砾石路面，沥青表面处治路面，半整齐石块路面；中级路面——碎、砾石路面，不整齐石块路面，其他粒料路面；低级路面——粒料加固土路面，其他当地材料加固或改善土路面。

At the same time, Our factory sells various kinds of specifications that the domestic and international producer produces throughout the year , Edge polisher, cutting machine, cloud stone glue, wax polish, diamond of type use soft tactics slice, bit, doing and waste various kinds of supplementary material, There are stock throughout the year.

同时，我厂常年经销国内外厂家生产的各种规格、型号的磨边机、切割机、云石胶、上光蜡、金刚石软磨片、钻头、干磨片等各种辅助材料，常年备有现货。

More than 10 series, more than 20 kinds of cold-pressing pellets, coal-ball pressure and supporting products, this machine can be all kinds of slag, steel, iron oxide skin, refractories, pulverized coal to suppress the ball into different shapes Mission, For combustion, sintering.

十多个系列，二十多种冷压球团、型煤压球机与配套产品，本机可把各种矿粉、钢渣、氧化铁皮、耐火材料、煤粉压制成不同形状的球团，便于燃烧、烧结。

We also hired a Senior Engineer of Railways and professional managers, inspectors, and Bao-Bridge, Bridge Hill set up a speed turnouts fittings supply agreement, developed over 170 kinds of polymer materials specifications for new products, so far my plants have produced railway signal insulation, a variety of products line up more than 560 kinds of products and services at all Railway Bureau Electricity Services Section, Public Works Section, Coal Mining Bureau and Taiwan, was the vast numbers of users.

我们还聘请了铁道部高级工程师及专业管理人员、检查人员，并与宝桥、山桥建立了提速道岔配件供货协议，开发了170多种规格的高分子材料新产品，至今我厂已生产的铁路信号绝缘、各种线类产品达560余种，产品服务于各铁路局电务段、工务段、煤炭矿务局及台湾等地，身受广大用户好评。

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。