下列物质属于纯净物的是 [ ]
A.铁锈
B.氧化铁
C.石灰石
D.硬铝
答案：B
Thanks for me your house .[ ]
A. invite, for
B. inviting, to
C. inviting, for
D. invitation, for
预计利润表中的销售收入与编制现金预算表时用到的销售收入含义相同，( )
.[ ]