当消费者从每种商品消费中得到的总效用不断增加时边际效用也是递增的()
参考答案:错
---Excuse me, Sir. _____either she or I selected to join the team?
----Sorry, neither she or you ______.
A.Am ;are
B.Is ; are
C.Are; are
D.Is; is
电时间无法查明时,窃电日数至少按()天计算。
A.30天;
B.90天;
C.180天;
D.210天;