一般情况下，在搜寻的边际效用（）边际成本是达到最佳搜寻.
参考答案：等于
Speaker A: Would you please close the window I feel a bit cold. Speaker B:______
A．All right. I hope someone will close it.
B．Oh, I'm sorry, but maybe you should put on your sweater. We need some fresh air.
C．Who has opened the window I feel cold too.
D．If you feel cold, you can put on more clothes.
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