厂商利润最大化的条件是( )。
A.MR<MC
B.MR>MC
C.MR=MC
D.MR≥MC
参考答案:C
在正常情况下安全电压规定为36V以下。
—Let's eat out this evening.
—______ Have you got the first prize in the speech competition?
A. Why not?
B. What for?
C. Yes, I'd love to.
D. Thank you very much.