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【简答题】
Time is very important in our life. It our everyday moments. However, time never had any importance in my life until I a watch from my father, which organized my life and made me more responsible. It's around my wrist with two silver bands. I received this gift on a gray-sky day. I went to the airport a.m. to up my uncle Ali and take him to my house. However, I was late because I was with my friends. Later, around 11:00 a.m. I my uncle , but he had left the airport and taken a taxi to my house. I got to my house at 2:00 p.m. and felt of myself at that moment. After I said hello to my angry father and tired uncle, my father asked me to sit next to him and handed me this watch as a gift from him. Then he said, 'Peter, did you have with your friends today? I answered, 'Yes, Father, and I apologized for not meeting my uncle Ali.' He said, 'What you was not very nice and you should feel sorry for your action.' I was ashamed and said, 'Father, I'll never do it again. I promise.' He said, 'I hope today you learned something important, and this watch will be a for you.' He told me to take this watch and use it as an organizer of my life. I learned a very important lesson from my father: to respect time and never to be late to get someone. This watch is to me, not because of its price, but because of the lesson that I learned from it. 小题1: A．makes B．organizes C．orders D．deals 小题2: A．received B．accepted C．won D．achieved 小题3: A．call B．put C．pick D．bring 小题4: A．going B．leaving C．standing D．shopping 小题5: A．forgot B．remembered C．saw D．visited 小题6: A．ashamed B．frightened C．disappointed D．shy 小题7: A．lunch B．quarrel C．chance D．fun 小题8: A．said B．did C．thought D．forgot 小题9: A．wonder B．hope C．requirement D．reminder 小题10: A．useful B．necessary C．important D．helpful
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【单选题】对于教学数据库的三个基本表：S(Sno，Sname，Ssex)，SC(Sno，Cno，Grade)，C(Cno，Cname， Teacher)，其中S为学生表，SC为学生选课表，C为课程表，则对于语句：检索至少选修LIU老师所授课课程中一门课程的女生姓名，SQL语句错误的是______。
A.
SELECT Sname FROM S，SC，C WHERE S.Sno=SC.Sno AND SC.Cno=C.Cno AND Teacher=‘LIU’AND Ssex=‘F’
B.
SELECT Sname FROM S WHERE Ssex=‘F’AND Sno IN (SELECT Sno FROM SC WHERE Cno IN(SELECT Cno FROM C WHERE Teacher=‘LIU’))
C.
SELECT Sname FROM S WHERE Ssex=‘F’AND EXISTS (SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT*
D.
SELECT Sname FROM S WHERE Ssex=‘F’AND EXISTS(SELECT* FROM SC WHERE SC.Sno=S.Sno AND EXISTS (SELECT*
【单选题】在本实验整流、滤波电路中如果在变压器付方输出电压U2=12V时，用万用表直流档测量的U0值为5.4V，可能出了什么故障？
A.
电容开路，同时整流桥的一个桥臂二极管开路
B.
负载开路，同时整流桥的一个桥臂二极管开路
C.
电容短路，同时整流桥的一个桥臂二极管开路
D.
负载开路，同时整流桥的一个桥臂二极管短路
【单选题】在本实验整流、滤波电路中，如果变压器付方输出电压U2=12V时，用万用表直流档测量滤波后负载的电压U0值为10.8V，可能出了什么故障？
A.
负载开路，
B.
电容开路
C.
整流桥开路
D.
是正确测量值。
【简答题】今年是中华人民共和国成立( )周年。
【多选题】从student(sno,sname...)表和sc(sno,cno...)表,查询选修001号课程的学生姓名,下列语句表达正确的是( )。
A.
select sname from student，sc where student.sno=sc.sno and cno='001'
B.
select sname from student where sno = (select sno from sc where cno='001')
C.
select sname from student where sno in (select sno from sc where cno='001')
D.
select sname from student where exists (select * from student where cno='001' )
【单选题】设有关系S(SNO，SNAME，SEX)，C(CNO，CNAME)，SC(SNO，CNO，GRADE)。其中SNO为学生号，SNAME为学生姓名，SEX为性别，CNO为课程号，CNAME为课程名。要查询选修“计算机”课的全体女学生姓名的SQL语句是SELECTSNAMEFROMS，C，SC WHERE子句。这里WHERE子句的内容是
A.
S.SNO＝SC.SNO andSEX＝'女'andCNAME＝'计算机'
B.
S.SNO=SC.SNO andC.CNO＝SC.CNO andCNAME＝'计算机'
C.
SEX='女'andCNAME='计算机'
D.
S.SNO＝SC.SNO andC.CNO＝SC.CNO andSEX='女'andCNAME='计算机'
【简答题】对于教学数据库的三个基本表：S(Sno，Sname，S)，SC(Sno，Cno，Grade)，C(Cno，Cname， Teacher)，其中S为学生表，SC为学生选课表，C为课程表，则对于语句：检索至少选修LIU老师所授课课程中一门课程的女生姓名，SQL语句错误的是______。 A) SELECT Sname FROM S，SC，C WHERE S.Sno=SC.Sno AND SC.C...
【单选题】在本实验整流、滤波电路中，如果变压器付方输出电压U2=12V时，用万用表直流档测量滤波后负载的U0值为16.8V，可能出了什么故障？
A.
负载断路
B.
负载短路
C.
电容短路
D.
电容开路
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