@article {樊春2020北大直播课堂,
	title = {北大直播课堂: 让教师 {\textquotedblleft}零门槛{\textquotedblright} 在线教学},
	journal = {中国教育网络},
	year = {2020},
	author = {樊春 and 来天平 and 欧阳荣彬 and 张蓓}
}
