对于同一个消费者来说,同样数量的商品总是提供同量的效用。()。
A.正确;
B.错误;
C.可能正确也可能错误。
参考答案:A
—Do you know the man under the tree?
—Sorry, I don't know [ ]
A. how is he
B. what is he
C. who he is
D. where he is
什么是天平的感量(分度值)?