单选题:请在第__(55)__处填上正确答案。 题目分类:理工类 题目类型:单选题 查看权限:VIP 题目内容: 请在第__(55)__处填上正确答案。 A.fought B.weighted C.respected D.selected 参考答案: 答案解析:
学生表中有"学号"、"姓名"和"年龄"三个字段,SQL语句"SELECT 学号 FROM 学生"完成的关系操作称为( 学生表中有"学号"、"姓名"和"年龄"三个字段,SQL语句"SELECT 学号 FROM 学生"完成的关系操作称为( )。 A.选择 B.投影 C.连接 D. 分类:理工类 题型:单选题 查看答案
请在第__(48)__处填上正确答案。 请在第__(48)__处填上正确答案。A.If you are feeling down, you normally don't sit straight, w 分类:理工类 题型:单选题 查看答案
There are various forms of adult education, including_______ There are various forms of adult education, including__________.A.by social and 分类:理工类 题型:单选题 查看答案
The policeman wrote down all the particulars of the accident The policeman wrote down all the particulars of the accident.A.secrets B.details 分类:理工类 题型:单选题 查看答案
The study suggests that it is more difficult to respond what The study suggests that it is more difficult to respond what to get rid of.A.Rig 分类:理工类 题型:单选题 查看答案