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33.SQLServer
中的存储过程有哪些主要的优点?
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42.设有如下实体: 学生:学号,姓名,性别,出生日期 课程:课程号,课程名,学分,学时 教师:教师号,姓名,性别,职称 单位:单位名称,电话,办公地址 其中,一个学生可选修多门课程,一门课程可被多个学生选修,学生选学课程后要记录考试成绩;一个教师可讲授多门课程,一门课程可由多个教师讲授,教师讲授一门课程要记录教师的工作量;一个单位有多个教师,一个教师只能属于一个单位。 (1)试画出反映上述实体关系的E-R图。(不必画实体的属性) (2)转换成关系模式,并指出每个关系模式的主码和外码(如果有外码指出来),在主码下画直线________,在外码下画波浪线_______
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1. Questions 1 to 5 are based on the following passage:John had bought a packet of cigarettes just before we caught the train and he offered me one as we settled ourselves in our compartment. We were on our way back from a camping holiday;we had lived rough for over a fortnight and even a cigarette was a luxury at that moment.I felt in my pocket for a box of matches,but could not find any.“I haven't got any either,” said John.Sitting opposite to us was a man whose face was hidden by a newspaper.“Excuse me,sir,”said John,leaning across. “Could you give me a light,please?”The newspaper was lowered to reveal a rather elderly man with a stern face.“This is a no smoking compartment,”the man said. He indicated the notice near the window. We apologized and put away our unlit cigarettes.The man went on,in a rather more kindly way,to warn us against the dangers of smoking.“I speak as a doctor,”he concluded,and after that he went back to reading his newspaper.When he got out a few stations later,he left his newspaper behind him. We picked it up,eager to find out what had happened while we were on holiday.“Just look at this,”remarked John,pointing to a photograph. “it's the man who was sitting opposite us.” Underneath the photograph was an account of a lunatic (精神病者)who had recently escaped. It appeared that he liked to pretend to be a doctor.(10分)1.1 The friends had spent their holiday ______.(2分)A. on a boatB. in a tentC. on a farmD. with an aunt
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下列不属于HDLC帧类型的是()
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如果直线y=ax+2与直线y=3x-b关于直线Y=x对称,那么(??)
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In Chinese culture,red happiness,so brides usually wear red on their wedding days.(1分)
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