What is Ms. Rawson trying to find out?
A.How much mortgage payments are
B.How many previous owners there have been
C.How long her grandparents owned the house
D.How much competition there is
第9题
A.并、差、交、笛卡儿积、除法
B.并、差、笛卡儿积、投影、选择
C.并、差、交、投影、选择
D.并、差、笛卡儿积、自然连接、除法
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