要使函数有意义，需使
x-1≥0且x-3≠0
解得x≥1且x≠3
故答案为{x|x≥1且x≠3}
---- _______ ?
----Well, he’s tall. He dresses nicely.
A．What does your friend look like
B．Is your friend tall
C．How is your friend
D．Could you meet him
输入到本国的商品再出口时，称为（）。
A、复出口
B、复进口
C、出口转内销
D、专门贸易
