A、冗余系统
B、表决系统
C、混合系统
D、储各系统
此题为判断题(对,错)。
设一个系统上100个互相独立起作用的部件所组成,每个部件损坏的概率为0.1,必须有85个以上的部件工作才能使整个系统工作,则整个系统工作的概率为()
A、0.95211
B、0.87765
C、0.68447
D、0.36651
对下面图(a)所示系统,仅当部件1,部件2和部件3全部正常工作时系统才能正常工作。图中数字为各部件的可靠性,整个系统的可靠性近似为(9)。如果将部件2和部件3改成由两个器件构成,如图(B) 所示,只要器件a和b中有一个正常就能使部件1正常工作,只要器件c和d中有一个正常就能使部件3正常工作。图中数字是各器件可靠性,则部件2的可靠性是(10),整个系统的可靠性近似为(11)。
A.0.68
B.0.72
C.0.8
D.0.92
运算器是计算机的指挥系统,可以控制整个计算机的各个部件有条不紊地工作.【】
Unit 1 Automotive BasicsAutomobiles, trucks, and buses are essential forms of transportation. They are complex machines made up of many parts. These parts can be grouped into a number of systems. An understanding of how the system work will help you understand how the automobile works.轿车、卡车和客车是交通运输的重要组成部分。它们都是由许多部件组成的复杂机器。这些部件可以归类为汽车的几个组成系统。了解这些各个小系统是如何工作的将有助于我们理解整个汽车系统是如何工作。An automobile can be divided into two basic parts: a body and a chassis. The body is the enclosure that houses the engine, passengers, and cargo. It is the part of the automobile that you see. The chassis is that part of the automobile beneath the body.汽车可以分为两个基本部分:车身和底盘。车身包围发动机、乘客和行李,它是汽车你所看到的部分。而车身以下的部分就是底盘。1.1 THE BODY An automobile body is a sheet metal shell with windows, doors, a hood, and a trunk deck built into it. It provides a protective covering for the engine, passengers, and cargo. The body is designed to keep passengers safe and comfortable. For example, insulation in the body reduces noise and protects against heat and cold. The body styling provides an attractive, colorful, modern appearance for the vehicle. It is streamlined to lessen wind resistance and to keep the car from swaying at driving speeds.轿车车身是一个钣金件壳体,它上面有车窗、车门、发送机罩和行李舱门等部件,它给发动机、乘客和行李提供防护。车身设计来确保乘客乘坐的安全和舒适。比如:车身绝热层可以减少噪音和抵御冷热。车身造型设计使得汽车有一个华美、现代、吸引人的外观。车身的流线型设计可以减少风阻,防止汽车行驰过程中发生摆动。The automobile body has two basic parts-the upper body and the under body.车身有两个基本部分-车身上部和车身下部。1.2 The chassis The chassis is an assembly of those systems that are the major operating parts of a vehicle. The chassis includes everything except the body. The three important parts of the chassis are the frame, the engine, and the power train (also called the drive train). Each of these three parts is made up of a number of systems. A system is a mechanical or electrical unit that performs a specific function. Thus, each system (such as steering, brake, or fuel) has a certain job to do in running a vehicle. We shall look at each of these parts and systems to see how they fit together to form the automobile chassis.底盘集中了汽车大部分的运动组件,它包括除了车身以外的所有部件。底盘有三个重要的系统:车架、发动机和传动系统。这三个系统又都有许多个完成某一个特定功能的机械或电气系统组成。为了保证汽车正常运转,每个系统(比如:转向、制动或燃油系统)都要实现一定的功能。下来我们看看这些系统和组件是如何相互连接从而组成汽车底盘的。1.2.1 The frame The first major part of the chassis is the frame. It is made from tough steel sections welded, riveted, or bolted together. The frame looks like a steel ladder, though it sometime has an X shape for extra strength. It forms a foundation for the car body and the parts of the several systems. The body is joined to the frame with bolts. Rubber shock mounts or washers are used at each joint. These reduce vibration and road noise. In most modern cars the fram、e is built into the body. A car with the frame built into the body has a unitized body or unibody. The frame supports the suspension system, steering system, and the braking system.底盘最重要的部分就是车架。车架由钢件通过焊接、铆接或螺栓联接而成,看上去就像一架钢梯。有时为了得到额外的强度,车架做成了 X 形状。车架为车身和很多系统部件提供了底1座。车身和车架使用螺栓联接。每个联接使用橡胶防震支架或垫圈来减振降噪。现、代轿车车架和车身做在了一起。采用这个形式的汽车车身叫做承载式车身。车架支撑悬架、转向和刹车系统。The front and rear wheels are attached to the chassis by a suspension system. This system is made up of springs, shock absorbers, control arms, and stabilizers. These support the vehicle and cushion it from road bumps for better ride and handling.前后轮通过悬架系统和底盘相连。悬架系统由弹簧、减振器、控制臂和横向稳定杆组成。它们支撑着车身,并减缓由于路面不平引起的颠簸,以获得更好的乘坐舒适性和操作稳定性。The steering system controls the car
计算机输入输出子系统,通常由()、()和()等3个层次的逻辑部件和设备共同组成,()用于连接计算机的各个部件为一体,构成完整的整机系统,在这些部件之间实现信息的相互沟通与传送。
计算机总线;输入输出接口;输入输出设备;计算机总线
略
发动机是由许多机构和系统组成的,这些机构和系统是按一定的顺序和程序参加发动机的工作循环,把电能转换为机械能,实现动力输出。
A对
B错
微机的硬件由哪些部件组成的?它们是如何工作的?
液压系统主要由主动部件、工作部件、()和辅助装置等组成。
CPU包括哪几个部件?它们是如何配合工作的?