3.6 有其它学者对这项研究的抽样提出质疑,认为基本不存在一个包含所有农民工个体的抽样框。这实际上是在质疑研究哪方面的效度问题?
危机协调的纵向协调机制主要包括哪些内容:
13. W: You used to complain a lot about your boss, but today it’s different.
M: We had a heart-to-heart talk and I saw him with new eyes.
Q: What does the man mean?