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【简答题】
数据管理技术的发展大致经历了3个阶段,即人工管理阶段、______________和______________。 数据模型的3个要素为______________、______________和______________。 客观存在并且可以相互区别的事物称为______________。 联系的3种类型,即______________、______________和______________。 数据模型分为3种类型,即______________、______________和______________。 关系型数据库采用______________结构来描述实体以及实体间的联系。 专门的关系运算有______________、______________和______________3种。 E-R模型的3个要素是______________、______________和______________。
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反馈参考答案：
举一反三
【简答题】设晶体是负的，玻璃的折射率为n．分别就下列四种情形确定自然光经过图16-5(a)中的棱镜后双折射光线的传播方向和振动方向： (1)n=n o ； (2)n=n e ； (3)n o ＞n＞n e ； (4)n＞n o ．
【简答题】A. Her parents are on the same trip. B. She enjoys traveling to different countries. C. She was born in that country. D. She enjoys the travel very much.
【单选题】A.He forgot to ask about her hobbies.B.He heard she enjoys music concerts.###SX
A.
He forgot to ask about her hobbies.
B.
He heard she enjoys music concerts.
C.
He thinks she enjoys traveling.
D.
He has no idea what she likes to do.
【单选题】What does John say about his cousin's interests?
A.
He forgets to ask about her hobbies.
B.
He hears she enjoys music concerts.
C.
He thinks she enjoys traveling.
D.
He doesn't know what she likes to do.
【简答题】若变量a是String类型的变量，那么表达式(a+ A) 的类型是______。A) char B) String C) int D) long
【多选题】如果我的网站用的UTF8编码为了防止乱码都需要注意哪些地方()
A.
数据库和表都是用utf8_general_ci编码
B.
连接数据库指定utf8(“SET NAMES UTF8”)
C.
php文件头编UTF8header(“content-type:text/html;charset=utf-8”)
D.
html文件指定utf-8
【单选题】材料题请点击右侧查看材料问题 查看材料
A.
She enjoys traveling in summer holidays.
B.
She'd like to have wicked experience.
C.
She is a food lover and spends a lot on food.
D.
She lives a life of a normal student.
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