{"id":162,"name":"CH1-2 Exercise The natural of economic problem and opportunity cost","extension":"mp4","fileType":"1","modifiedDate":"2022-03-25 19:37:38","ownerId":"3","publicity":"1","driveContentType":2,"deletedTime":"2022-04-25 18:14:40","recordedDate":"2022-04-25 18:14:40","recordedBy":"717"}