有三个关系R、S和T如下.则由关系R和S得到关系T的操作是(  )。

有三个关系R、S和T如下.则由关系R和S得到关系T的操作是(  )。A.自然连接 B.交 C.投影 D.并

查看答案

George cooked me a meal, _________ was a first for him.

George cooked me a meal, _________ was a first for him.A.what B.when C.who D.wh

查看答案

The lady formed a friendship with the old shoemaker because

The lady formed a friendship with the old shoemaker because________. A.she had

查看答案

若有定义语句:“char sE10]="1234567\0\0";”,则strlen(s)的值是( )。

若有定义语句:“char sE10]="1234567\0\0";”,则strlen(s)的值是( )。A.7 B.8 C.9 D.10

查看答案

定义下列结构体(联合)数组:struct st{ char name[15];int age;}a[10]={"ZHA0

定义下列结构体(联合)数组:struct st{ char name[15];int age;}a[10]={"ZHA0",14,"WANG",15,

查看答案