这里的习题用于清华大学计算机系2019年春季课程练习。

这里包括从互联网上搜集的操作系统课程相关习题和答案，包括部分考研试题，版权属于各出题单位或个人。由清华大学OS课的老师和助教撰写的习题和答案的文档版权属于清华大学，并采用 Creative Commons Attribution/Share-Alike (CC-BY-SA) License.

OS习题集采用gitbook

## install 
sudo npm install -g gitbook-cli
cd THIS-DIR
gitbook install; 

## publish
gitbook serve;
   ...
   Starting server ...
   Serving book on http://localhost:4000

## view contents
netbrowser(firefox, chrome...)  http://localhost:4000

的方式展现，可进行在线交互式答题。

下面是gitbook提供的试题编写的例子：

{%mcq ans="o1"%} {%title%} This is a question? {%o1%} First option {%o2%} Second option {%o3%} Third option {%o4%} Fourth option {%endmcq%}

{%mcq ans="o1", count=2%} {%title%} This is a question? {%o1%} First option {%o2%} Second option {%o3%} Third option {%o4%} Fourth option {%hint%} This is a hint. {%endmcq%}

{%mcq ans="o1", count=2%} {%title%} This is a question? {%o1%} First option {%o2%} Second option {%o3%} Third option {%o4%} Fourth option {%o5%} Fourth option {%o6%} Fourth option {%o7%} Fourth option {%o8%} Fourth option {%endmcq%}

{%mcq ans="o1", random=true%} {%title%} This is a question? {%o1%} First option {%o2%} Second option {%o3%} Third option {%o4%} Fourth option {%endmcq%}

This is a spoiler: {%s%}Hello World.{%ends%}

{%fbq%}Testing. Please type $$hello## (hello) and $$world## (world).{%endfbq%}

What is gitbook used for?

Is it quiz?

This is multiple dropdown quiz, in each dropdown select a correct number corresponding to the dropdown's order