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Variable speed system of cycloconverter-fed multiphase synchronous motor is a major area in the development of high-power AC drive system because of its small dimension, large capacity, high torque, high-rate power, wide-range variable speed, low harmonic pollution, and reliable safety. In the low-speed and large-capacity industrial drives, such as rolling mills, winding motors, marine propeller, cement mixer, etc. it will find a wide application in the future.

采用多相同步电动机的交交变频调速系统，具有体积小、容量大、高转矩、高功率比、宽平滑调速区、谐波污染小、安全可靠的特点，是大功率交流调速领域的主要发展方向之一，在轧机，矿山卷扬，船舶推进，水泥球磨机等低速大容量的场合有着广泛的应用前景。

take yangling national agricultural high-tech zone as the research base, by analyzing 37 agricultural high-tech enterprises in shaanxi, this paper summarizes the four modes of agricultural high-tech enterprises in china: derivative mode, central mode, cooperative mode and commission mode.

以杨凌国家农业高新技术产业示范区作为研究基地，通过对示范区内37家农业高新技术企业的调查分析，归纳总结出我国农业高新技术企业技术创新的四种模式：衍生型、中心型、合作型和委托型。

Cinder cone volcanoes are formed when magmas with high gas contents and high viscosity are blown high into the air during an eruption.

火山渣锥火山是，当爆发时，高气体含量和高粘度的熔岩被喷发到空气中而形成的。

Our company is applying advanced production facility,exoeruebced management and top talents.with policy of high starting point,high quality and high taste,and human-based design theory,based on top quality,professional service and reliable,we use 100% top raw material for production ,after years experience,our products are well received by major users,we become a first class manufacturing base for clotheshorse in Eastern of Guangdong.

我们秉承了高起点、高质量、高品味的宗旨，以品质至优，服务至上，诚信至真为基础，和"以人为本"的人性化设计理念，始终坚持产品100%全部采用顶级原材料，必经多道工序，道道皆精，绝不添加废料、杂料的原则，在公司全体公司员工的不懈努力下，得到众多用户的认同和信赖，目前在粤东地区已是一家上层次，上规模的晾衣架生产基地。

As to the property of its cutting and modeling, GH4169 is characterized by high intensity, high plasticity, great resistance to cutting, serious cold-work hardening, high-temperature cutting, serious abrasion of the cutting tool.

其切削加工特点主要表现为强度高，塑性大，切削抗力大，冷作硬化严重，切削温度高，刀具在加工过程中磨损剧烈，以攻丝为加工最难点，小直径的螺孔用普通攻丝方法几乎无法加工，已经严重影响了公司的生产进度和产品质量。

The invention relates to an amplifier circuit containing a high-frequency transistor (1) and having a circuit (2) for adjusting the operating point, which provides a base current for the high-frequency transistor (1) according to the voltage released at a resistor (3) which is connected in the collector ring of the high-frequency transistor (1). The circuit (2) has a differentiating unit (20), fed by the supply voltage, which compares the voltage released at the resistor (3) with a reference voltage.

带有高频晶体管(1)的放大器电路具有一个用于工作点调整的电路(2)，其依赖于在连接在高频晶体管(1)的集电极电路中的电阻(3)上下降的电压为高频晶体管(1)提供基极电流，电路(2)具有一个由供电电压馈电的差分节(20)，其把在电阻(3)上下降的电压与基准电压比较。

OF super grade, Grade I and II is exported. Fine talcum powder is of high whiteness in very fine granula tion which feels soft and slippery, so it is used in hitech fields, such as paint and coating industry, it is also used in paper making industry. Besides calcine talcum powder from 200 mesh to 1250 mesh is used in china and pottery industry. The following kinds such as Qixia3-grade blocks, 3-grade grains, 4 grade block and 4-grade grains are used as raw materials of china and pottery products. When 15% 80% of talcum powder is added in porcelain ,the Final china products is of very heat expansion, but of high strength, transparency and brilliance in colure and of very high percentage silicon , alg but of very low percentage of iron and aluminium.

特、一、二级产品90%以上出口；超微细滑石粉具有较高的白度、极细的微粒，柔软而有滑腻感，主要应用于高新技术领域，在油漆、涂料工业中用作体质填充料，在造纸工业中，用于涂层和涂料，可以改善纸张光泽和着墨性等；200目—1250目煅烧滑石粉主要应用于陶瓷釉面等；栖霞三级块、三级小粒、四级块、四级小粒是陶瓷生产的主要原料，在瓷土中掺入15%—80%的滑石粉，制成的各种瓷器，具有极少的热膨胀和温膨胀性，有强度高、不龟裂、增强韧性及透明度高、色彩明亮美丽等特点，并且以特别高的硅、镁和特别低的铁、铝含量而闻名陶瓷行业。

Capital invested in high-risk or relatively high-risk securities and enterprises, in expectation of commensurately high returns.

投资于高风险或相对高风险的证券和企业，以期得到相应的高收益。

"Communization of high school" and "Specialization of comprehensive high school" are the main goals of improving the problems in comprehensive high schools.

七、高中职社区化与综合高中特色化是改善综合高中问题的两大目标。

In order to drive a high impedance load such as HPM sources, it is necessary to commutate FCG's long pulse width, high-current and low voltage pulse to a short pulse with high voltage.

为用FCG驱动象HPM源这样较高阻抗的负载，必须使用脉冲功率调制电路把FCG产生的低电压、大电流、上升时间长的电压脉冲转化为高电压、上升时间短的脉冲。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。