首页
›
答案
›
题库
›
慕课
›
未分类
p（）：a system of fixed rules and formal behavior used at official meetings
p（）：a system of fixed rules and formal behavior used at official meetings
正确答案：protocol
标签：
现代邮政英语
上一条：
i （）：to combine two or more things so that they work together
下一条：
c（）：polite, especially in a way that shows respect