本文章对一些markdown语法进行测试

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python
import os
os.getcwd()
os.chdir('~/Desktop')
print('test approved')
R
library(ggplot2)
iris_test = iris
a <- c(1,2,3)
b <- c(2,3,4)
p <- ggplot(a,b)
bash
ssh -i file.pem
Mysql
select * from `order` where city in ('墨尔本', '悉尼');