查询词典 main current

In the design of the power supply, the main circuit topology frame uses full-bridge series resonant switching and parallel load connection, in which, four MOSFETs are adopted as the power switches, and by four pulses which UC3879 produces, high frequency operation and fast response are realized. In addition, the MOSFET in the switching power supply has no hard turn-on or turn-off situation in transition, thus the disturbance to the power system is avoided. Especially,by the use of high frequency transformer, PQ50/50, the switching power system can provide the steady discharge current without any amperite.

此开关电源采用全桥软开关技术、串联谐振并联输出，四个MOSFET管为主控制开关元件，通过脉冲产生电路UC3879产生的四路相关脉冲实现了高频交替开关，同时能快速响应输出的各种变化；避免了开关管的硬开关，提高了转换效率，另外通过采用高频变压器PQ50/50隔离了原副边，减小了高次谐波对电网干扰；无需镇流电阻也可实现气体稳定放电。

The highlights in brief they were more of consensus documents: I would say that there were they reconfirmed the safety of current PCI technology including the stenting; the highlight precautious attitude towards multivessel disease and left main lesion; we have seen that also we should probably readjust a little bit to think about it.

简要地说，此次热点多为专家的一致意见，我能说上来的有比如重新证实了目前PCI技术，包括支架的安全性问题、对多支血管病变和左冠状动脉主干病变持谨慎态度，因此我们在这方面的看法可能应该略作调整。

In this article preliminary analysis current English hearing study has existed the main question, simultaneously elaborated English hearing study strategy and the study skill, for raise English study hearing level to provide the help.

本文初步分析了当前英语听力学习中存在的主要问题，同时阐述了英语听力学习的策略和学习技巧，为提高英语学习者的听力水平提供帮助。

It's pointed out that soft sensor will play more important role in field bus network control system. According to this, a crude solution was addressed. At last, we point out that soft sensor technology must used to build an information warehouse for the whole enterprise, combined with data fusion, data warehouse, data rectification and other related technologies. The main contributions of this dissertation are as follows: The background, requirement, and application situation of soft sensors are expounded, the theories, methods and skills of soft sensing technology are analyzed, and the fruits and problems in current soft sensor technologies are summarized. Some new methods of soft sensor is proposed: A principal component analysis-based secondary variable selection method are proposed; A new conception which modeling data should have gross error detection is addressed, and then a cluster analysis-based modeling data gross error detection method is given.

本文的主要贡献有：对软测量技术根据实践的要求进行了一定的理论研究，针对具体问题提出了新的方法：讨论了辅助变量选择问题，研究了基于主元分析的辅助变量选择方法，该方法克服了传统方法只能利用数学模型产生的仿真数据进行最优辅助变量选择的缺点，可以根据历史数据进行辅助变量选择；提出了建模数据显著误差侦破的概念，指出传统的显著误差侦破研究的是已知过程数学模型的情况，而建模时数学模型是未知的，但是直接来自现场的数据并不能保证不含显著误差，并用基于聚类分析的方法解决了该问题，该方法利用聚类分析原理，直接面对过程数据，不需以过程模型为基础，在此基础上给出了软测量建模过程中样本数据的处理方法。

Elaborated the development of biology pesticide Bt and application from the angle of the market, stressing integral product idea while, emphasize particularly on management of market industry chain, discussed current main problem to offer improvement and development proposal.

从市场的角度阐述了生物农药Bt的发展和应用，在强调整体产品概念的同时，侧重市场产业链管理，讨论了目前的主要问题并提出改善与发展建议。

Now high schools have two main tasks: propaedeutic to enter a higher school and propaedeutic to take up an occupation after graduation. So how should we adjust and enrich various resources according to the spirit of the reform in the whole country and local schools and in terms of the history、tradition and current situation of schools? And how to change the style of administration on new curriculum during the process of carrying it out in order to adapt to the requirement for the setting-up and implementation of new curriculum? It is really a big challenge for the stabilization and innovation of schools.

如何按照国家和地方课程改革的精神，根据学校的历史传统和现实情况的实际，调整和充实各种教育资源，合理地设置国家课程和学校课程，构建符合课程改革要求并具有学校鲜明特色的课程体系，以及在实施新课程的过程中如何适当地改革课程管理方式以适应课程设置与实施的要求，都对承担着升学预备教育和就业预备教育双重任务的普通高中提出了巨大的挑战，对高中学校的稳定、创新与发展提出了严峻的考验。

During the accident, the main steam pressure drops rapidly, the current and outlet temperature of pulverizer become abnormal.

明确了主蒸汽压力快速下降和磨煤机电流、出口温度异常变化是该类型事故的主要现象，指出石子煤冲洗系统冲洗水采用母管制和系统相关阀门工作环境恶劣造成阀门易磨损卡涩是导致磨煤机进水事故发生的根本原因。

In order to avoid the limitation of using only Tobin's Q to evaluate marketing performance and return on equity to evaluate financial performance, this paper introduces factor analysis to calculate synthesized performance, successfully processing totally 12 original indexes, such as return on net sales, average return on equity, return on total assets, per share earning ratio, current ratio, quick ratio, debt to assets ratio, rate of stock-turn, accounts receivable turnover, total asset turnover, main business growth rate, and total assets growth rate.

为了避免单纯使用托宾Q值度量企业市场业绩以及使用净资产收益率等单一财务指标度量企业财务业绩的缺陷，该文运用了因子分子法求得上市公司的综合绩效，成功地对总共12个原始绩效指标，如销售净利率、平均净资产收益率、总资产报酬率、每股收益、流动比率、速动比率、资产负债率、存货周转率、应收账款周转率、总资产周转率、主营业务收入增长率以及总资产增长率等进行了处理。

Current high school students have many mental health problems, the main ones are: rabidity of thinking, escapism, unable to face himself, lack of psychological tolerance, unable to face setbacks and so on, their reasons are social influence, family and personal factors, and some schools, writing teaching factors.

高中作文教学中渗透心理健康教育有一定优势，也是作文教学自身发展的需要。

Radial component of magnetic field is one of main limits of Bi2223/Ag magnet's critical current and stability.

在Bi2223/Ag超导磁体里，磁场的径向分量是限制其超导带临界电流和性能的主要因素之一。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。