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只将结果输出到打印机,不在屏幕上显示,应使用命令序列()

A. SET DEVICE TO PRINT 和@3,10 SAY "姓名: " 、+姓名
B. SET PRINT ON 和@3,10 SAY " 姓名: "+姓名
C. SET PRINT ON 和 SET DEVICE TO @3 ,10 SAY "姓名: "+姓名
D. LIST “姓名:“+姓名T0 PRINT

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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

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