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【单选题】
关系模型有三类完整性约束：实体完整性、参照完整性和用户定义的完整性。下列选项中 ( )是关系模型必须满足并由DBMS自动支持的。A.
实体完整性
B.
实体完整性和参照完整性
C.
参照完整性和用户定义的完整性
D.
实体完整性、参照完整性和用户定义的完整性
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举一反三
【单选题】What is the main purpose of this text?
A.
To introduce the status quo of religious freedom in Egypt.
B.
To ask for help in alleviating the restricted religious freedom in Egypt.
C.
To force the government into action of some changes.
D.
To promote the idea that freedom of choice and citizenship shall be based on equal rights rather than membership of a privileged religion.
【单选题】interface Data { public void load（）； } abstract class Info { public abstract void load（）； } Which class correctly uses the Data interface and Info class？（）
A.
public class Employee extends Info implements Data { public void load（） { /*do something*/ } }
B.
public class Employee implements Info extends Data { public void load（） { /*do something*/ } }
C.
public class Employee extends Info implements Data { public void load（） { /*do something */ } public void Info.load（） { /*do something*/ } }
D.
public class Employee implements Info extends Data { public void Data.load（） { /*dsomething */ } public void load（） { /*do something */ } }
E.
public class Employee implements Info extends Data { public void load（） { /*do something */ } public void Info.load（）{ /*do something*/ } }
F.
public class Employee extends Info implements Data{ public void Data.load（） { /*do something*/ } public void Info.load（） { /*do something*/ } }
【简答题】He decided to make further improvements on the computer's design _____ the light of the requirements of customers. (A) on (B) for (C) in (D) with
【单选题】The author wants to maintain the status quo because______.
A.
he believes slower vehicles do not need any more access
B.
he agrees with minimum speed limits
C.
he believes that minimum speed limits should be eradicated
D.
he believes in the rights of slower vehicles
【简答题】It seems that manufacturers will remain reluctant to make improvements unless ________. A) they can do so as a very low cost B) they find their machines hard to operate C) they have difficulty selling...
【单选题】下列程序的运行结果为()。 #include using namespace std; class B{ protected: char ver; public: B(){ ver = 'B'; } virtual void print(){ coutprint(); } int main(){ B b; D1 d1(4); D2 d2(100); D3 d3(-25...
A.
The B version B The D1 info: 4 version 1 The D2 info: 100 version B The D3 info:-25 version 3
B.
The B version B The B version 1 The B version B The B version 3
C.
The B version B The D1 info: 4 version 1 The D2 info: 100 version B The B version 3
D.
The B version B The B version 1 The D2 info: 100 version B The D3 info: -25 version 3
【简答题】判断语句编程题: 输入一个字符,判别它是否为大写字母,如果是,将它转换成小写字母;如果不是,不转换。然后输出最后得到的字符。 将程序截图和两种运算结果(1输入为大写,2输入为小写)截图分别上传(三张照片或截图)
【单选题】_______ is our belief that improvements in heal
A.
4. _______ is our belief that improvements in healthcare will lead to a stronger, more prosperous economy. （浙江） A. As
B.
That
C.
This
D.
It
【单选题】bonanza, status quo
A.
people or situation
B.
problems and obstacles
C.
rates
D.
states of affairs or situations.
【简答题】status quo:(100 words)
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