题目内容

维生素B1由_______与_______通过_______相连,主要功能是以_______形式,作为________和_______的辅酶,转移二碳单位。

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维生素B6是________衍生物,也称吡哆素,有_______,_______,_______三种形式,可以以_______,_______的形式作为氨基酸_______,_______,_______的辅酶。

生物素可看成由_______,_______,________三部分组成,是_______的辅酶,在_______的固定中起重要作用。

查询计算机系任意学生选修过的课程号,不正确的查询语句是:

A. SELECT DISTINCT CnoFROM SCWHERE NOT EXISTS (SELECT SnoFROM StudentWHERE Sdept = 'CS'AND SC.Sno = Student.Sno);
B. SELECT DISTINCT CnoFROM SCWHERE EXISTS (SELECT SnoFROM StudentWHERE Sdept = 'CS'AND SC.Sno = Student.Sno);
C. SELECT DISTINCT CnoFROM SCWHERE Sno IN (SELECT SnoFROM StudentWHERE Sdept = 'CS');
D. SELECT DISTINCT CnoFROM SCLEFT JOIN StudentON SC.Sno = Student.SnoWHERE Sdept = 'CS';

查询学号为201215121的同学选修过的所有课程的名字,不正确的查询语句是:

A. SELECT CnameFROM CourseLEFT JOIN SCON Course.Cno = SC.CnoWHERE Sno = '201215121';
B. SELECT CnameFROM CourseWHERE Cno IN (SELECT CnoFROM SCWHERE Sno = '201215121');
C. SELECT CnameFROM CourseWHERE EXISTS (SELECT *FROM SCWHERE SC.Cno = Course.CnoAND Sno = '201215121');
D. SELECT CnameFROM CourseWHERE NOT EXISTS (SELECT *FROM SCWHERE SC.Cno = Course.CnoAND Sno = '201215121');

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