【多选题】以下哪些现象反映了边际收益递减规律的应用。()
【单选题】Nowadays many parents want to have their kids ____ to as much art and culture as possible. [ ]
【单选题】All the following problems are implied as possible causes of campus suicide incidents EX- CEPT ______.
B.
failing to get proper sleep
C.
lack of family concern
D.
family history of mental illness
【多选题】以下哪些现象反映了边际收益递减规律的应用。()
【多选题】以下哪些现象反映了边际收益递减规律的应用。()
【多选题】以下哪些现象反映了边际收益递减规律的应用。( )