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【单选题】
以下关于主键的描述中,错误的是()。
A.
主键的值不能重复
B.
主键的值不能为空
C.
未建主键的两个表不能建立关系
D.
未建主键的两个表可以建立关系
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参考答案：
举一反三
【单选题】— What _______ if you _______ on the Titanic? — What a question! [     ]
A.
would you do; were
B.
did you do; were
C.
had you done; would have been
D.
would you have done; had been
查看完整题目与答案
【单选题】What impact would it bring if the current situationis not controlled?
A.
There would be a big explosion.
B.
There would be climate change.
C.
There would be an ecological damage.
D.
There would be natural disaster.
查看完整题目与答案
【简答题】本程序的功能:查找所有满足下面条件的两个整数对:1、两个整数都是3位数;2、组成两个整数各位的数字各不相同并且不出现数字0;3、第二个数等于第一个数的两倍。 例如,134和268就是满足该条件的一个整数对。 #include int main() { int a,b,c,j,k,w,e[6],sum; for(a=1; a999) 1 、 ; e[3]=sum/100; e[4]=(sum-e...
查看完整题目与答案
【单选题】在窗体上画一个名称为Command1的命令按钮,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim a As Variant a = Array(1, 2, 3, 4, 5) Sum = 0 For i = 1 To 5 Sum = Sum + a(i) Next i x = Sum / 5 For i = 1 To 5 If a(i)...
A.
1 2 3
B.
3 4 5
C.
4 5
D.
1 2
查看完整题目与答案
【单选题】在窗体上画一个名称为 Command1 的命令按钮,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim a As Variant a = Array(1, 2, 3, 4, 5) Sum = 0 For i = 1 To 5 Sum = Sum + a(i) Next i x = Sum / 5 For i = 1 To 5 If a(...
A.
1
B.
123
C.
345
D.
45
查看完整题目与答案
【单选题】What would happen if the reader were dissatisfied with the newspaper?
A.
The newspaper would send a complimentary issue.
B.
The subscription would be extended.
C.
The reader would be contacted.
D.
The subscription price would be refunded.
查看完整题目与答案
【简答题】在窗体上画一个名称为Command1的命令按钮,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim a As Variant a = Array(1, 2, 3, 4, 5) Sum = 0 For i = 1 To 5 Sum = Sum + a(i) Next i x...
查看完整题目与答案
【简答题】What would you like to start with? What does this mean?A. Who is going to choose first? B. What dish you would like at the beginning of your meal?
查看完整题目与答案
【单选题】A:( ), David? B:An orange juice.
A.
What do you like
B.
What would you like
C.
Would you like an orange juice
查看完整题目与答案
【单选题】What is sum after the following loop terminates? sum = 0 item = 0 while item 4: break print(sum)
A.
8
B.
7
C.
6
D.
5
查看完整题目与答案
相关题目：
【单选题】— What _______ if you _______ on the Titanic? — What a question! [     ]
A.
would you do; were
B.
did you do; were
C.
had you done; would have been
D.
would you have done; had been
查看完整题目与答案
【单选题】What impact would it bring if the current situationis not controlled?
A.
There would be a big explosion.
B.
There would be climate change.
C.
There would be an ecological damage.
D.
There would be natural disaster.
查看完整题目与答案
【简答题】本程序的功能:查找所有满足下面条件的两个整数对:1、两个整数都是3位数;2、组成两个整数各位的数字各不相同并且不出现数字0;3、第二个数等于第一个数的两倍。 例如,134和268就是满足该条件的一个整数对。 #include int main() { int a,b,c,j,k,w,e[6],sum; for(a=1; a999) 1 、 ; e[3]=sum/100; e[4]=(sum-e...
查看完整题目与答案
【单选题】在窗体上画一个名称为Command1的命令按钮,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim a As Variant a = Array(1, 2, 3, 4, 5) Sum = 0 For i = 1 To 5 Sum = Sum + a(i) Next i x = Sum / 5 For i = 1 To 5 If a(i)...
A.
1 2 3
B.
3 4 5
C.
4 5
D.
1 2
查看完整题目与答案
【单选题】在窗体上画一个名称为 Command1 的命令按钮,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim a As Variant a = Array(1, 2, 3, 4, 5) Sum = 0 For i = 1 To 5 Sum = Sum + a(i) Next i x = Sum / 5 For i = 1 To 5 If a(...
A.
1
B.
123
C.
345
D.
45
查看完整题目与答案
【单选题】What would happen if the reader were dissatisfied with the newspaper?
A.
The newspaper would send a complimentary issue.
B.
The subscription would be extended.
C.
The reader would be contacted.
D.
The subscription price would be refunded.
查看完整题目与答案
【简答题】在窗体上画一个名称为Command1的命令按钮,然后编写如下程序: Option Base 1 Private Sub Command1_Click() Dim a As Variant a = Array(1, 2, 3, 4, 5) Sum = 0 For i = 1 To 5 Sum = Sum + a(i) Next i x...
查看完整题目与答案
【简答题】What would you like to start with? What does this mean?A. Who is going to choose first? B. What dish you would like at the beginning of your meal?
查看完整题目与答案
【单选题】A:( ), David? B:An orange juice.
A.
What do you like
B.
What would you like
C.
Would you like an orange juice
查看完整题目与答案
【单选题】What is sum after the following loop terminates? sum = 0 item = 0 while item 4: break print(sum)
A.
8
B.
7
C.
6
D.
5
查看完整题目与答案
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