多项选择题

新生儿缺氧缺血性脑病脑损伤主要累及部位正确的是

A．A足月新生儿易累及额颞部
B．B足月新生儿易累及矢状旁区
C．C早产儿易累及苍白球、纹状体
D．D早产儿易累及脑室周围白质区

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未分类题

Questions 16 to 18 are based on the passage you have just hearD.A.He obtained his philosophy degreE.B.He sold his own life on the Internet.C.He became famous for his websitE.D.He requested to part with his girltrienD.

A.A.He
B.He
C.
C.He
D.He
E.

单项选择题

设有关系模式R（A，B，C），其中A为主关键字，则以下不可能完成的操作是________。 A、从R中删除2个元组 B、修改R第3个元组的B分量值 C、把R第1个元组的A分量值修改为Null D、把R第2个元组的B和C分量值修改为Null

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