单项选择题

蛔虫成虫具有“钻孔”习性，其造成的阑尾炎为临床上最常见的并发症
A、正确
B、错误

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单项选择题

（Qualification）___________________, the awareness of metaphorical expressions in different cultures may facilitate intercultural communication

A．It is certain
B．Beyond any doubt
C．On the limited data available
D．It is impossible

单项选择题

Division is an additional operation in relational algebra, it can be replaced by which set of the following operations equivalently : A、Select, Project, Cartesian-Product B、Union, Project, Cartesian-Product C、Select, Rename, Cartesian-Product D、Set difference, Project, Cartesian-Product

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