1、采用两级压缩的原因 单级压缩压缩比为10时最低蒸发温度 2、两级压缩制冷环 单级压缩的压比一般为:617≤82R210

制冷系统中循环流动的工作介质叫制冷剂 (又称制冷工质)，它在系统的各个部件间 循环流动以实现能量的转换和传递，达到 制冷机向高温热源放热；从低温热源吸热， 实现制冷的目的

This ram air is generated by the aircraft flight speed and is driven into the primary heat exchanger by a special scoop. This scoop has often a variable geometry electrically driven depending on of the flight phase (take off, cruise, etc.). 5 th step :

I．Choose the Correct Answer 1. A disturbance can be written x b xt b t a y(x,t) (e e e ) 2 2 −( / ) 2 / − = . This disturbance is （ D ） (A) Not a traveling wave. (B) A traveling wave with speed v = a. (C) A traveling wave with speed v = a/b. (D) A traveling wave with speed v = b

Changes in the Nature of Work The Interweaving of Technology and Jobs Changes in the Design of Jobs (there will be no stable jobs in the future Integration of Contingent Workers into the Workforce Increased Emphasis on Continuous Learning External Control of Performance Standards by Customers (Boom of services industry) Limitations on Leadership and Supervision Changes in the Structure of Work From Individuals to Teams

CMS技术与人力资源管理 员工素质及员工选择 CIMS技术环境对员工素质的要求: 中广泛的知识面(CMS将市场分析、产品设计、加工制造、经营管理、售 后服务整个生产活动作为紧密相连不可分割的整体来进行管理) 中交际和相互沟通能力(各部门之间的联系更为紧密)

测评主体采用科学的方法,收集被测评者在主要活动领域中的表征信息,针对某一素质测评目 标系作出量值或价值的判断的过程。或者直接从表征信息中引发与推断某些素质特性的过程。 类型

The dynamics of many-particle systems is called statistical mechanics. The kinetic theory is a special aspect of the statistical mechanics of large number of particles. Suitable averages of the physical characteristics and motions of individual particles provide information about the macroscopic behavior of the system as a whole

一、电路的基本概念与基本定律 二、电阻电路的分析方法 三、正弦交流电路 四、三相电路

一、电工基础知识和单相交流电路 二、三相交流电路 三、磁路和变压器 四、交流异步电动机 五、低压电器及控制电路 六、建筑施工现场供电 七、建筑电气照明