题目内容

改革仅限于经济体制的改革()

查看答案
更多问题

检索选修四门以上课程的学生总成绩(不统计不及格的课程 ),并要求按总成绩的降序捧列出来。正确的 SElECT 语句是()

A. SELECT S,SUM(GRADE)FROM SC WHERE GRADE>=60 CROUP BY S ORDER BY 2 DESC HAVING COUNT(*)>=4
B. SELECT S,SUM(GRADE)FROM SC WHERE GRADE>=60 GROUP BY S HAVING COUNT(*)>=4 ORDER BY 2 DESC
C. SELECT S,SUM(GRADE)FROM SC WHERE GRADE>=60 HAVINC COUNT(*)>=4 GROUP BY S ORDER BY 2 DESC
D. SELECT S,SUM(GRADE) FROM SC WHERE GRADE>=60 ORDER BY2 DESC GROUP BY S HAVING COUNT(*)>=4

气瓶水压试验装置的内部必须保证清洁,禁油与()气瓶的试验装置不得混用

低压气瓶是指公称工作压力小于()的气瓶

钢质无缝气瓶瓶体存在弧疤、焊迹或()等热损伤而使金属受损的气瓶应报废

答案查题题库