T3210的启动原因是(),逾时值为()s.
T3210的启动原因是(),逾时值为()s.
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用SQL语言检索选修课程在5门以上(含5门)的学生的学号、姓名和平均成绩,并按平均成绩降序排序,正确的命令是( )。A.SELECT S.学号,姓名,平均成绩 FROM S,SC;WHERE S.学号=SC.学号;GROUP BY S.学号 HAVING COUNT(*)=5 ORDER BY 平均成绩 DESCB.SELECT 学号,姓名,AVG(成绩) FROM S,SC;WHERE S.学号=SC.学号AND COUNT(*)=5;GROUP BY 学号 ORDER BY 3 DESCC.SELECT S.学号,姓名,AVG(成绩) 平均成绩 FROM S,SC;WHERE S.学号=SC.学号AND COUNT(*)=5;GROUP BY S.学号 ORDER BY 平均成绩 DESCD.SELECT S.学号,姓名,AVG(成绩) 平均成绩 FROM S,SC;WHERE S.学号=SC.学号;GROUP BY S.学号 HAVING COUNT(*)=5 ORDER BY 3 DESC
用SQL语言检索选修课程在5门以上(含5门)的学生的学号、姓名和平均成绩,并按平均成绩降序排序,正确的命令是A)SELECT S.学号,姓名,平均成绩FROM S,SC; WHERE S.学号=SC.学号; GROUP BY S.学号HAVING GOUNT(*)=5 ORDER BY平均成绩DESCB)SELECT学号,姓名,AVG(成绩)FROM S,SC; WHERE S.学号SC.学号AND COUNT(*)>=5; GROUP BY学号ORDER BY 3 DESCC)SELECT S.学号,姓名,AVG(成绩)平均成绩FROM S,SC; WHERE S.学号=SC.学号AND COUNT(*)=5; GROUP BY S.学号ORDER BY平均成绩DESCD)SELECT S.学号,姓名,AVG(成绩)平均成绩FROM S,SC; WHERE S.学号=SC.学号; GROUP BY S.学号HAVING COUNT(*)=5 ORDER BY 3 DESC
假设有如下的记录类型: Type Student number As String name AS String age As Integer End Type 则正确引用该记录类型变量的代码是______。A.Student. name="" s. name="张红"B.Dim s As Student s. Dame="张红"C.Dim s As Type Student s. name="张红"D.Dim s As Type s. name="张红"
如下程序段定义了学生成绩的记录类型,由学号、姓名和三门课程成绩(百分制)组成。 TYPE STUD NO AS INTEGER NAME AS ATRING SCORE(1 TO 3) AS SINGLE END TYPE 若对某个学生的各个数据项进行赋值,下列程序段中下确的是A.DIM S AS STUD STUD. NO=1001 STUD. NAME="舒宜" STUD. SCORE=78,88,96B.DIM S AS STUD S. NO=1001 S. NAME="舒宜" S. SCORE=78,88,96C.DIM S AS STUD STUD. NO=1001 STUD. NAME="舒宜" STUD. SCORE(1)=78 STUD. SCORE(2)=88 STUD. SCORE(3)=96D.DIM S AS STUD S. NO: 1001 S. NAME="舒宜" S. SCORE(1)=78 S. SCORE(2)=88 S. SCORE(3)=96
查询选修课程在5门以上(含5门)的学生的学号、姓名和平均成绩,并按平均成绩降序排序,正确的命令是A.SELECT s.学号,姓名,平均成绩FROM student s,score sc WHERE s.学号=sc.学号 GROUP BY s.学号HAVING COUNT(*)=5 ORDER BY平均成绩DESCB.SELECT学号,姓名,AVG(成绩)FROM student s,score sc WHERE s.学号=sc.学号AND COUNT(*)=5 GR0UP BY学号ORDER BY 3 DESCC.SELECT s.学号,姓名,AVG(成绩)平均成绩FROM student s,score sc wHERE s.学号=sc.学号AND COUNT(*)=5 GROUP BY s.学号ORDER BY平均成绩DESCD.SELECT s.学号,姓名,AVG(成绩)平均成绩FROM student s,score sc WHERE s.学号=sc.学号 GROUP BY s.学号HAVING COUNT(*)=5ORDER BY 3 DESC
用SQL语言检索选修课程在5门以上(含5门)的学号、姓名和平均成绩,并按平均成绩降序排序,正确的命令是A.SELECT S.学号,姓名,平均成绩FROM S,SC; WHERE S.学号=SC.学号; GROUP BY S.学号 HAVING COUNT(*)>=5 ORDER BY 平均成绩 DESCB. SELECT 学号,姓名,AVG(成绩)FROM S,SC; WHERE S.学号=SC.学号AND COUNT(*)>=5; GROUP BY 学号 ORDER BY 3 DESCC.SELECT S.学号,姓名,AVG(成绩)平均成绩 FROM S,SC; WHERE S.学号=SC.学号AND COUNT(*)>=5; GROUP BY S.学号 ORDER BY平均成绩 DESCD.SELECT S.学号,姓名,AVG(成绩)平均成绩 FROM S,SC; WHERE S.学号;SC,学号; GROUP BY S.学号 HAVING COUNT(*)>=5 ORDER BY 3 DESC
给定关系模式R(A,B,C,D.、S(C,D,E.,与π1,3,5(σ2='软件工程'(R?S))等价的SQL语句如下:SELECT ( ) FROM,SWHERE (请作答此空) ;下列查询B="信息"且E="北京"的A、B、E的关系代数表达式中,查询效率最高的是 ( ) 。A.B=软件工程ORR. C=S. CAND.R. D=S. DB.B='软件工程'ORR. C=S. CANDR. D=S. DC.B='软件工程'ORR. C=S. CORR. D=S. DD.B='软件工程'AND.R. C=S. C.AND.R. D=S. D
A.B=软件工程ORR. C=S. CA.ND R. D=S. DB.B=‘软件工程’ORR. C=S. CA.NDR. D=S. DC.B=‘软件工程’ORR. C=S. CORR. D=S. DD.B=‘软件工程’A.ND R. C=S. C A.ND R. D=S. D
关于定时器启动触发原因,以下说法正确的是:()A、T3174启动的触发原因是:收到“分组小区更改命令”消息B、T3190启动的触发原因是:收到“分组下行分配”消息C、T3310启动的触发原因是:当MS发送出“附着请求”后启动
单选题学生表:S(学号,姓名,性别)和选课成绩表:SC(学号,课程号,成绩),用SQL语言检索选修课程在5门以上(含5门)的学生的学号、姓名和平均成绩,并按平均成绩降序排序,正确的命令是( )。ASELECT S.学号,姓名,AVG(成绩)平均成绩 FROM S,SC;WHERE S.学号=SC.学号;GROUP BY S.学号,姓名 HAVING COUNT(*)=5 ORDER BY 3 DESCBSELECT S.学号,姓名,AVG(成绩) FROM S,SC;WHERE S.学号=SC.学号 AND COUNT(*)=5;GROUP BY 学号,姓名 ORDER BY 3 DESCCSELECT S.学号,姓名,AVG(成绩) 平均成绩 FROM S,SC;WHERE S.学号=SC.学号 AND COUNT(*)=5;GROUP BY S.学号,姓名 ORDER BY 平均成绩 DESCDSELECT S.学号,姓名,平均成绩 FROM S,SC;WHERE S.学号=SC.学号;GROUP BY S.学号,姓名 HAVING COUNT(*)=50RDER BY 平均成绩 DESC