根据现行部颁定额,模板制作与安装定额子目,均以()为计量单位。
A.m2
B.m3
C.t
D.100m2
参考答案:D
— Is that ______ dog?
— No. ______ is white. [ ]
A. her; Her
B. her; His
C. he; His
D. his; His
对于教学数据库的三个基本表:S(Sno,Sname,Ssex),SC(Sno,Cno,Grade),C(Cno,Cname,Teacher),其中S为学生表,SC为学生选课表,C为课程表,则对于语句:检索至少选修LIU老师所授课课程中一门课程的女生姓名,SQL语句错误的是______。
A.SELECT Sname FROM S,SC,C WHERE S.Sno=SC.Sno AND SC.Cno=C.Cno AND Teacher='LIU' AND Ssex='F'
B.SELECT Sname FROM S WHERE Ssex='F' AND Sno IN (SELECT Sno FROM SC WHERE Cno IN(SELECT Cno FROM C WHERE Teacher='LIU'))
C.SELECT Sname FROM S WHERE Ssex='F' AND EXISTS (SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT* FROM C WHERE Teacher='LIU'))
D.SELECT Sname FROM S WHERE Ssex='F' AND EXISTS (SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT* FROM C WHERE C.Cno=SC.Cno AND Teacher='LIU'))