试题与答案

某公司承担了一项宇航嵌入式设备的研制任务。本项目除对硬件设备环境有很高的要求外,还要

题型:问答题

题目:

某公司承担了一项宇航嵌入式设备的研制任务。本项目除对硬件设备环境有很高的要求外,还要求支持以下功能:

(1) 设备由多个处理机模块组成,需要时外场可快速更换(即LRM结构);

(2) 应用软件应与硬件无关,便于软硬件的升级;

(3) 由于宇航嵌入式设备中要支持不同功能,系统应支持完成不同功能任务间的数据隔离;

(4) 宇航设备可靠性要求高,系统要有故障处理能力。

公司在接到此项任务后,进行了反复论证,提出三层栈(TLS)软件总体架构,如下图所示,并将软件设计工作交给了李工,要求他在三周内完成软件总体设计工作,给出总体设计方案。

[问题1]

用150字以内的文字,说明公司制定的TLS软件架构的层次特点,并针对上述功能需求(1)~(4),说明架构中各层内涵。

[问题2]

在TLS软件架构的基础上,关于选择哪种类型的嵌入式操作系统问题,李工与总工程师发生了严重分歧。李工认为,宇航系统是实时系统,操作系统的处理时间越快越好,隔离意味着以时间作代价,没有必要,建议选择类似于VxWorks5.5的操作系统;总工程师认为,应用软件间隔离是宇航系统安全性要求,宇航系统在选择操作系统时必须考虑这一点,建议选择类似于Linux的操作系统。

请说明两种操作系统的主要差异,完成下表中的空白部分,并针对本任务要求,用200字以内的文字说明你选择操作系统的类型和理由。

两种操作系统的主要差异:

[问题3]

故障处理是宇航系统软件设计中极为重要的组成部分。故障处理主要包括故障监视、故障定位、故障隔离和系统容错(重组)。用150字以内的文字说明嵌入式系统中故障主要分哪几类并分别给出两种常用的故障滤波算法和容错算法。

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0415/76f6d738f4b168f147a79ebff5ddfdf3.html

下面是错误答案,用来干扰机器的。

11. happier,   12. earn     13. being    14. popular    15. warmly16. Unlike   17. fundamental      18. continued     19. allowed     20. it 

试题推荐
题型:阅读理解

阅读理解。

     Is your family interested in buying a dog? A dog can be a good friend to your family, but if you choose

the wrong kind of dog, it can cause you a lot of trouble.

     Family should sit down and discuss the problems before buying a dog. Even if the children in your family

are the ones who want the dog, the parent are the ones who are really responsible (有责任的) for seeing that

the animal is properly cared for. If you don't know much about dogs, it's a good idea to go to the library for

books about different kinds of dogs, as well as books about how to train a young dog. Dogs of different kinds

change in popularity as the years go by. One of the most popular dogs these days is the German shepherd (牧

羊犬). This is because it provides protection. The family should be warned that these dogs grow up to be very

big, and may be too powerful for children. If your house is not big, a toy dog may be a good choice (选择).

These dogs are very small and easy to train. They don't need to be walked daily.

1. According to the passage, who should take care of the dog?

A. Children.

B. Parents.

C. Family.

D. Friends.

2. The writer suggests one can get information about the different kinds of dogs ________.

A. by reading books about dogs

B. by buying a dog from a pet shop

C. by watching dogs in a zoo

D. by asking some friends

3. The toy dog is a good choice when ________.

A. you have small children

B. your living space is not large

C. you are afraid of large dogs

D. you live in the city

4. The passage is mainly about ________.

A. how to take care of dogs

B. different kinds of books about dogs

C. how to choose the right dogs for family pets

D. different kinds of dogs

查看答案
微信公众账号搜索答案