出口仪器的报检时必须提供生产企业(包括加工厂、冷库、仓库)的卫生注册或登记号码( )
参考答案：对
已知集合A={x|x是小于8的正整数}，B={1，2，3}，C={3，4，5，6}，求A∩B，A∩C，A∩（B∪C），A∪（B∩C）
How did I find the man who left the paper().
A.He came back for the paper.
B.He came back for more copying.
C.He came to me.
D.He invited me to his home.
