题型:填空题 —Do you think it will rain tomorrow? — . It hasn't rained for a whole month! It's too dry. [ ]A. I hope so B. I hope not C. I'm sure it will 查看答案
题型:填空题 假设MC和AC分别代表边际成本曲线和平均成本曲线,以下说法中正确的有______。A.MC>AC时,AC下降 B.MC<AC时,AC下降C.MC=AC时,AC达到最低点 D.MC=AC时,AC达到最高点 查看答案