LATEX 临时抱佛脚

http://www.cnblogs.com/Dzhouqi/p/3739175.html

三线表

https://blog.csdn.net/ch1209498273/article/details/78848464

https://blog.csdn.net/guifeng93/article/details/81035335

https://blog.csdn.net/tmylzq187/article/details/51595970

特殊符号