可试验的

The foundation of this system provides a good reference to promote the standardization and intelligence of the overhaul and maintenance of vacuum switches. This paper develops a special HF pulse power supply for internal pressure estimation, which achieves the output of HF-HV sinusoidal pulse wave whose frequency and amplitude can be modified respectively, and meets the design requirements according to the results of Simulink simulation and practical experiments. With the help of AT89S52, this paper designs an I~2C serial bus based signal detection system for peak value signal acquisition of HF pulse currents, which communicates with the upper computer by asynchronous serial communication for uploading the data. In the upper computer, a human computer interface is developed by Matlab software, whose functions are to do some computation and graphic display, such as calibrating the relation curve of vacuum degree and peak value of HF pulse currents, vacuum degree computation, and vacuum lifetime evaluation analysis basing on grey forecasting model as well as making relative suggestions.

本文研制了用于真空度检测的高频脉冲电源，通过Simulink仿真和试验检验其满足设计要求，实现了电压幅值和频率独立可调的正弦波高频高压脉冲输出；利用以AT89S52为核心基于I~2C串行总线的信号检测系统实现高频脉冲电流峰值信号的采集，通过异步串行通信实现单片机与计算机之间的数据通信，将检测数据传至上位机；在上位机利用Matlab开发人机交互界面，实现相关数据处理和图形显示，包括真空度——高频脉冲电流峰值关系曲线标定、真空度数值计算、基于灰色预测模型的真空寿命评估分析和提出相应决策建议。

For them, the activities of Burgh and those like him are indicative of what could become a dangerous new trend, in which groups of seriously ill people get together online to discuss, source and try untested drugs whose safety and efficacy is uncertain.

对专家而言，象伯格这样的人的做法反映社会上已经形成一种危险的新趋势，即重症病人已经在互联网上形成一个群体，他们彼此交流心得，相互提供信息，一起服用未经试验的药物，可这些药物的安全性及有效性还不明确。

Because the expensive tunable laser is not available in laboratory, the high-luminosity halogen lamp is considered as the multiplex photosource, at results, the cost become lower and the program keep more practicable. A experimental scheme of 16 channels wave demultiplex based on volume holographic technology is designed, and its channel capacity, noisiness, cut-in loss, isolation and storage persistence are analyzed.

采用高亮度溴钨灯代替价格昂贵的大功率可调谐激光器作为波长解复用试验的光源进行设计，有效降低实验成本，设计出基于体全息技术的16通道波分解复用器的实验方案，并分析该器件的信道容量、噪声特性、插入损耗、隔离度以及存储持久性等主要性能指标。

In view of the battery protection and the rational use of power, people proposed to the development of charging technology. In the mid-1960s, U.S. scientists Maas on battery charge in the process made a lot of problems Export pilot study, put forward a minimum rate of Export the prerequisite for an acceptable battery charge current curve.

鉴于对蓄电池的保护及电能的合理利用，人们提出要发展充电技术。20世纪60年代中期，美国科学家马斯对蓄电池充电过程中的出气问题作了大量的试验研究工作，提出了以最低出气率为前提的蓄电池可接受的充电电流曲线。

Adopting macro(survey data and statistical data)and micro data combined methods,thedissertation,studies the relationship between nitrogen application amount and yield,nitrogenefficiency and environment loss from province,region,city,county,and township different level,assesses rationality of nitrogen,phosphorus,potassium fertilizer application amount of paddyfield ecosystem in Tai lake area,discusses ecological and economic nitrogen application amountcombining with field experiment results,puts forward the suggestions of nitrogen sustainablemanagement in Tai lake area.

文章采用宏观和微观相结合的研究方法，从省域、流域、县域、乡域等不同尺度来研究江苏太湖地区氮肥施用与产量、氮肥利用率及氮肥环境损失的关系，对太湖地区稻田生态系统的NPK肥水平的合理性进行了评价，并结合田间试验的分析结果，探讨了生态经济施氮量，提出了太湖地区氮素可持续管理的建议。

Based on the compressibility experiment of rubbed korshinsk peashrub at different temperatures ranging from 22℃ to 140℃, the mathematical models were established which could explain the relationships between the pressure and volumetric strain, the pressure and compressed density as well as the bulk modulus and compressed density, and the effect of temperature on the compressibility of rubbed korshinsk peashrub was obtained.

该文通过对揉碎柠条在22～140℃范围内4个不同温度下的压缩试验，建立了柠条在压缩过程中压力与体积应变、压力与压缩密度以及体积模量与压缩密度的数学模型，获得了温度对揉碎柠条可压缩性的影响规律。

Therefore, planting scallion in summer fallow period in greenhouse can meliorate obviously soil biological environment and growing fast leaf vegetables and sweet corn can reduce obviously the accumulation of nutrient in the soil and inhibit the formation of alkalization.

从本试验的结果来看，在温室夏季休闲期种植大葱可以明显改善土壤的生物环境，种植速生叶菜和甜玉米可显著降低土壤的养分积累，减缓次生盐渍化的形成。

The whole series unitedly adopts the inner-cam controlling me-chanism of planting crank for the rotoring-vertical path.According to choice the technical parameters of the sliding way mechanism of steering arm and the results of experiment, the paper makes a sy...

本文根据系列插秧机转臂滑道机构设计参数的选择和生产试验的结果，较系统地阐述有关设计要点，初步提出了可供实际应用的设计方法。

Air compartment uses portable low noise to assist fan box, satisfied air compartment to take energy of life, vent one's anger the requirement that the type of the experiment changes.

风室采用可移动的低噪声辅助风机箱，满足了风室进气、出气试验的类型转换的要求。

The consequence of that mistake, as John Ioannidis of the University of Ioannina School of Medicine, in Greece, explained to the meeting, is that a lot of observational health studies—those that go trawling through databases, rather than relying on controlled experiments—cannot be reproduced by other researchers.

希腊约阿尼纳大学医学院的约翰。阿尼得士（John？？Ioannidis）在会上解释说这种误差的后果是诸多同类实验不能在其它实验室里得到复制，原因鉴于综合观测健康研究就像鱼网一样滤过资料，而没有依赖可控的对比试验病例。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。