Which of the following are types of members？（） A: non-registered users B: stores C: organizations D: products E: access grou

在linux中存放用户信息的文件是（）。 A: /etc/passwd B: /etc/login.def C: /etc/shadow D: /etc/grou

在Windows中，下列可以作为文件名的是______。 A: MY　PRKGRAM　GROU B: TXT C: FILE1｜FILE2 D: A<>C E: ADOC

If more than one raft is manned after the vessel has sunk，you should（）. A: go in a different direction in search of land B: spread out to increase the possibility of a search aircraft finding you C: reduce the number of rafts by getting as many people as possible into as few rafts as possible D: tie the rafts together and try to stay in a single grou

结构化查询语言SQL是一种______语言，其主要功能有______，它的典型句型为SELECT A1，A2，…，An FROM r1，r2，…，rm WHERE F 其中A1，A2，…，An和F分别是______。 关系模式SCS(Sno，Cno，Score)中，Sno是学生的学号，Cno是课程号，Score为成绩。若要查询每门课程的平均成绩，且要求查询结果按平均成绩升序排列。平均成绩相同时，按课程号降序排列，可用SQL语言写为______。若查询结果仅限于平均分数超过85分的，则应______。 A: SELECT Cno, AVG(Score) FROM SCS GROUP BY Score ORDER BY 2, Cno DESC B: SEIECT Cno, AVG(Score) FROM SCS GROUP BY Cno ORDER BY 2, Cno DESC C: SELECT Cno, AVG(Score) FROM SCS WHERE Cno, DESC GROUP BY Score D: SELECT Cno, AVG(Score) FROM SCS GROU PBY, AVG(Score) ORDER BY, Cno DESC