问题
选择题
We will go to Shanghai ______ the evening ______ May 2rd.[ ]
A. in, on
B. on, of
C. in, at
D. in, in
答案
答案：B
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We will go to Shanghai ______ the evening ______ May 2rd.[ ]
A. in, on
B. on, of
C. in, at
D. in, in
答案：B
a＞0，收益对价格的边际效应
，需求对价格的弹性为EP=b＞1．求P0和Q0．