差

Compared to ice precooling, water precooling and vacuum precooling,the advantages of pressure-difference precooling were introduced.

介绍了压差预冷技术相对于冰预冷、水预冷以及真空预冷的优点，综述了压差预冷技术在国内外的研究现状，同时指出目前压差预冷技术中存在的问题，预测今后的发展前景。

A cross shaped sum-difference network is constituted by microstrip ramose coupler with compact structure and calculated by ADS,while the 8×8 rectangular patchs,which is optimized by HFSS on basis of the method of parameter load and so on,form the transmiting/receiving antenna.

使用ADS优化设计了一种结构紧凑的&十&字形和差网络，并且使用参数加载等方法，在HFSS中仿真出一个8×8的微带矩形贴片天线阵列作为收/发天线，和差网络和微带天线阵列组成单脉冲天线阵。8×8天线阵列、和差网络和馈电系统在同一平面上，所以此天线阵列与传统单脉冲阵列相比体积更小，结构更紧凑，对该天线阵列进行了研制和测试，测试结果符合设计要求。

The results show that: from the subcircuit that is furthest to the heat source to the nearest one,the stability of DRS becomes gradually worse;the stability of RRS is symmetrical,with the subcircuit in the middle of the pipe-network having the worst stability,while,the nearer to the two ends,the better the stability of the subcircuits is.

结果表明，异程系统从离热源最近的支路到最远支路，稳定性依次变差；同程系统的稳定性具有对称性，网路中部的支路稳定性最差，越往两端，支路的稳定性越好；从总体上讲，同程系统的稳定性差于异程系统。

In this paper, a new model—transmissibility function model with conditional heteroscedasticity is proposed, and its conditions as well as the fitting and forecasting effect have been studied.

本文对残差具有异方差性的传递函数模型提出了一种新的模型——条件异方差传递函数模型，并对建立此类模型的条件和拟合及预测效果进行了研究。

But most of these systems developed under Windows OS are stand-alone software using different database, therefore they have many shortcomings such as poor transportability, working inefficiency, bad scalability, bad maintainability, and etc.

但目前使用的科研管理系统大多是早期开发的Windows操作系统下的单机版软件，使用不同的后台数据库，普遍存在着可移植性差、工作效率低、可扩展性差、可维护性差以及部署麻烦等缺点。

The new statistical analysis methods are mostly based on mixed linear model approaches for estimating variances and covariances, unbiasedly predicting random effects, analyzing conditional variaces and effets, and composite interval mapping.

基于混合线性模型的分析原理的统计分析方法包括方差和协方差估算方法、随机效应的无偏预测方法、条件遗传方差和条件遗传效应的分析方法、复合区间作图方法等。

For sheet-fed offset presses, plant height should be not less than 3. 5 m, apart from considering the height of the machine, you should have the height of the docurments underpan, scrolling the height of the steel tube (or the height of the 88 car activities), the height of the gantry and the height of the hoist, and so on, the best plant height of 4 m through 4. 2 m, height of less than 3 workshop. 5 metres, off off or more new equipment can occur when lifting into place.

差于单张纸胶印机来说，厂房低度答不超出3.5米，除了思考机械的低度边，还答有装箱底盘的低度、转不静钢惯的低度（或者勾当88小车的低度）、龙门架的低度和起轻葫芦的低度等，最坏的厂房低度为4米到4.2米，若厂房低度超出3.5米，差开或差开以上陈摆设起轻到位时会爆发便当。

Reference frame's uniformation methods, adjustment methods and the implication of corresponding datum for various adjustment methods are systematically discussed about high precision GPS network. The systematical investigates on the choice of reference station in the high precision GPS data processing and the effect to adjustment results are made. Some general principles on the choice of reference station are presented.

系统地讨论了高精度GPS网数据处理中参考框架的统一方法、平差方法及各种平差方法所对应基准的意义，针对高精度GPS数据处理中基准站选取对平差结果的影响进行了系统地分析，提出了基准站选取的一般原则。

In order to decrease total optical length, a design scheme was employed by selecting mechanically compensated zoom lens with a negative compensator, shortening the focus length of variator and compensator, and increasing the distance between front group and variator. An initial configuration was obtained by solving equations of aberrations. According to aberration theory, the aberrations were corrected by using ZEMAX optical design software.

为缩短筒长，采用负组补偿偏离物像交换变焦结构，缩短变倍补偿系统各组元焦距，增加前固定组和变倍组间距的设计方案，通过解初级像差方程求得初始结构，依据像差理论，利用ZEMAX自动设计软件进行像差校正平衡。

By adjustment processing and statistical analysis for the observations of gravity differences, it is indicate that the accuracy of gravity differences observed with 2-4 quartz spring gravimeters (Worden CG_2) can reach 10-20 10~(-8m/sec~2 for gravity networks and 25 10~(-8m/sec~2 for a line.

通过对观测段差的平差处理和统计分析，表明用2-4台Worden、CG_2重力仪进行重复测量的段差精度：测网可达10-2010~(-8米/秒~2，独立测线可达2510~

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。