Is there a problem? Why Hard? Syllabus EXamples AAS(FAA Advanced Automation System) FBI CIC IRS Modernization Program

武汉工程大学：《综合英语》（英文版） Final For English Majors 2003 (Level 2)(A)

Abstract Model Specifications Build an abstract model of required software behavior using mathematically defined(perhaps using axioms )types(e. g sets, relations) Define operations by showing effects of that operation on the model Specification includes Model

Requirements specification: A structured document that sets out the services the system is expected to provide Should be precise so that it can act as a contract between the system procurer and software developer and thus needs to be understandable by procurers and developers

L Language Structures(1 20=20 points) Directions: Choose the item that best completes each of the following sentences. When Grandma Wang became ill, the girl often A fitted in B worked out C held back D helped out

一、概念题 二、结构分析 三、轮系 四、齿轮 五、凸轮 六 、运动 七、连杆 八、调节

缺点： ① 制造和安装精度要求较高； ②不适宜用于两轴间距离较大的传动

一、棘轮机构的工作原理 二、棘轮机构的类型、特点和应用

1、定轴轮系：齿轮系传动过程中，其各齿轮的轴线 相对于机架的位置都是固定不变的

连杆机构 由低副（转动副、移动副、球面副、圆柱副、及螺旋副等）联结而成的机构。或称低副机构