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【单选题】
关系数据模型通常由3部分组成,它们是A.
数据结构，数据通信，数据完整性约束
B.
数据结构，数据通信，关系操作
C.
数据通信，数据操作，数据完整性约束
D.
数据结构，数据操作，数据完整性约束
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反馈参考答案：
举一反三
【简答题】试述一朵花是如何经过一系列的生长发育而成为果实的，花的各部分变化如何?
【简答题】何为生长发育?
【单选题】What is the proper attitude concerning sources?
A.
The source must be accessible.
B.
The source must be interesting.
C.
The source must be articulate.
D.
None of the above
【单选题】What is the proper characterization of the European Union (EU), and what is its primary accomplishment?
A.
The EU is a regional trade bloc which controls the money supply in each member country.
B.
The EU is a regional trade agreement that has eliminated most trade barriers between member countries.
C.
The EU is a trade treaty that provides a forum where member countries can resolve their trade disputes.
D.
The EU is a trading cooperative that protects member countries from unfair trade tactics by non-member countries.
【简答题】青少年正值快速生长发育阶段，活动量大，用脑多，因此食欲旺盛，食量明显增加．为生长发育的需要，你认为应该如何合理膳食？
【简答题】青少年正值快速生长发育阶段，活动量大，用脑多，因此食欲旺盛，食量明显增加。为什么生长发育的需要，你认为应该如何合理膳食？
【单选题】What is the proper characterization of the European Union (EU), and what is its primary accomplishment?
A.
a. The EU is a regional trade bloc which controls the money supply in each member country.
B.
b. The EU is a regional trade agreement that has eliminated most trade barriers between member countries.
C.
c. The EU is a trade treaty that provides a forum where member countries can resolve their trade disputes.
D.
d. The EU is a trading cooperative that protects member countries from unfair trade tactics by non-member countries.
【单选题】What is the proper meaning of the word, 'patriarchy'?
A.
Patriarchy is a social system where the emperor is the absolute head of the country.
B.
Patriarchy is a social system where the mother/wife is the absolute head of the family.
C.
Patriarchy is a social system where the father/husband is the absolute head of the family.
D.
null
【简答题】（5分）青少年正值快速生长发育阶段，活动量大，用脑多，因此食欲旺盛，食量明显增加。为什么生长发育的需要，你认为应该如何合理膳食？
【多选题】在Dreamweaver CS3中,如需在文本之间连续插入多个空格,可以使用以下______方法
A.
通过单击“换行”按钮输入
B.
在“常规”选项卡中选中“允许多个连续的空格”
C.
组合键:Ctrl+Alt+空格
D.
“插入记录”/“HTML”/“特殊字符”菜单命令中的“不换行空格”
E.
多选题
F.
30、表单按钮包括
G.
计算机网络与网页设计A
H.
中
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