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【单选题】
根据关系数据库基于的数据模型A.
只存在一对多的实体关系，以图形方式来表示
B.
以二维表格结构来保存数据，在关系表中不允许有重复行存在
C.
能体现一对多、多对多的关系，但不能体现一对一的关系
D.
关系模型数据库是数据库发展的最初阶段
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反馈参考答案：
举一反三
【单选题】对于移相控制电路，为了限制最小移相控制角和设置移相范围，可在输入控制信号的输入控制信号的输入端再叠加一个（）。
A.
交流电压
B.
偏移电压
C.
同步信号
D.
触发信号
【单选题】How do debaters select their positions?
A.
The positions are decided by the head judge
B.
The positions are selected by the debaters in turn
C.
The positions are given to debate teams at random
D.
The positions are arranged according to the ranking in previous debates
【判断题】Debaters can become effective citizens because they learn to think critically and argue skillfully
A.
正确
B.
错误
【单选题】How do debaters select their positions?
A.
the positions are decided by the head judge.
B.
the positions are selected by the debaters in turn.
C.
the positions are given to debate teams at random.
D.
the positions are arranged according to the ranking in previous debates.
【判断题】Effective debaters usually maintain a controlled pace, which helps them appear poised and confident despite the stress of the situation.
A.
正确
B.
错误
【单选题】Oppenheimer wants to show people the painting of van Gogh which isexample to show his _____interests.
A.
focus
B.
focused
C.
unfocuse
D.
unfocused
【单选题】Debaters can become effective citizens because _______.
A.
they learn to speak frankly
B.
they learn to think calmly
C.
they learn to respond quickly
D.
they learn to think critically and argue skillfully
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