皮皮学，免费搜题
登录
搜题
【简答题】
现有学生报考系统,实体“考生”有属性:准考证号、姓名、年龄、性别,实体“课程”有属性:课程编号、名称、性质。一名考生可以报考多门课程,考生报考还有报考日期、成绩等信息。 2 画出ER图,并注明属性和联系类型。(5分) 2将E-R图转换成关系模型 ,并注明主码和外码 (5分)
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】"Depend on yourself" is what nature says to every man. Parents can help you. Teachers can help you. Others still can help you. But all these people only help you to help yourself. There have been many...
【简答题】借贷记账法的账户,其左方一律称为“借方”。 ____
【单选题】用人单位违反职业病防治法规定，造成重大职业病危害事故或者其他严重后果，构成犯罪的，对直接负责的主管人员和其他（），依法追究刑事责任。
A.
直接责任人员
B.
责任人员
C.
管理人员
【简答题】 Passage 1 "Depend on yourself" is what nature says to every man. Parents can help you. Teachers can help you. Others still can help you. But all these people only help you to help yourself. There ha...
【单选题】用人单位违反职业病防治法规定,造成重大职业病危害事故或者其他严重后果,构成犯罪的,对直接负责的主管人员和其他( ),依法追究刑事责任。
A.
直接责任人员
B.
责任人员
C.
管理人员
D.
部门主管
E.
单位负责人
【简答题】在ROM 6547H单元起存放指令SJMP D9H，则执行完此指令(两字节)后，程序转向地址______H。
【单选题】听力原文：What we need here is a set of books that call be of great help to the compilation of the dictionary we are working on. What is the speaker probably doing?
A.
Compiling a dictionary.
B.
Writing a set of books.
C.
Offering some great help.
D.
Working for what they need.
相关题目：