皮皮学，免费搜题
登录
搜题
【单选题】
假设“课表记录”包含教室编号、上课时间、上课时间段、教师号、课程号五个数据项，其中一个教师可以开设不同的课程，一门课程可以由不同的教师开设，那么该数据流的结构在数据字典中的定义是（）。A.
课表记录=教室编号+上课时间+上课时间段+{教师号+课程号}
B.
课表记录=教室编号+上课时间+上课时间段+｛教师号｝+｛课程号｝
C.
课表记录=教室编号+上课时间+上课时间段+教师号+课程号
D.
课表记录=教室编号+上课时间+上课时间段+教师号+｛课程号｝
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】Among John Milton's poems, ______ is generally acknowledged to be the epic in English literature since Beowulf .
【简答题】怎么通过RFM模型监测客户消费异动?
【单选题】why does the woman choose to learn French?
A.
she has a keen interest in the french language and culture
B.
she wants to speak french as fluently as her grandfather
C.
she was forced by her grandfather to change her decision
D.
she thinks speaking french is a must for cultured people
【单选题】Why does decision-making scare some people?
A.
They fear making the wrong decision.
B.
They can't tell small decisions from big ones.
C.
There are too many decisions for them to make.
D.
Decision-making gives them a headache.
【单选题】I only caught a glimpse of the thief, so I can't really describe him.
A.
a quick look
B.
a close look
C.
a secret look
【简答题】I can't describe the _____ (sad) I felt seeing someone in so much pain.
【简答题】蛋白质多肽链中的肽键是通过一个氨基酸的 基和另一个氨基酸的 基连接而形成的。
【判断题】Beowulf is generally considered to be the work of a famous 8th-century Anglican poet.
A.
正确
B.
错误
【单选题】I only caught a glimpse of the thief, so I can't really describe him.
A.
a quick look
B.
a close look
C.
a secret look
D.
/
相关题目：
参考解析：
知识点：
题目纠错 0
发布
