更多"SimulationA considered B evalua"的相关试题:
[简答题]{{B}}Should Teachers Be Evaluated by Students {{/B}}
You are to write in three parts.
In the first part, state specifically what your opinion is.
In the second part, provide one or two reasons to support your opinion.
In the last part, bring what you have written to a natural conclusion or make a summary.
Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the instructions may result in a loss of marks.
[单项选择]设关系R：
经操作Л
A，B(σC=’c’(R))的运算结果是( )。(Л为“投影”操作符，σ为“选择”操作符)
A.
[单项选择]A client being evaluated in the emergency department complains of chest pain that radiates to his neck, shoulders, back, and arms, which decreases when he sits up and leans forward. Based on this assessment, the nurse suspects that he has（）
A. developed another myocardial infarction (MI).
B. endocarditis.
C. pericarditis.
D. myocarditis.
[多项选择]Should Teachers Be Evaluated by Students
You are to write in three parts.
In the first part, state specifically what your opinion is.
In the second part, provide one or two reasons to support your opinion.
In the last part, bring what you have written to a natural conclusion or make a summary.
Marks will be awarded for content, organization, grammar and appropriateness. Failure to follow the instructions may result in a loss of marks.
[单项选择]有三个关系R、S和T如下：
S
|
| B | C | D |
| f | 3 | h2 |
| a | 0 | k1 |
| n | 2 | x1 |
由关
A. 并
B. 自然连接
C. 笛卡儿积
D. 交
[填空题]It is useful to note that what has been evaluated here is the job and
[简答题]假定有两个关系R与S，其内容分别为：
R关系 S关系
A B C B C D
1 2 5 2 5 17
2 5 6 2 5 9
3 5 4 5 4 1
写出下列运算结果：
(1) (πA,B(R))×(πC(S))。
(2) [*]
[单项选择]设有如下关系表：
T
|
| A | B | C |
| 1 | 1 | 2 |
| 2 | 2 | 3 |
| 3 | 1 | 3 |
则下列操作中正确的是______。
A. T=R∩S
B. T=R∪S
C. T=R×S
D. T=R/S
[单项选择]有A、B、C三种投资产品，其收益的相关系数如下：
| A | B | C |
A | 1 | | |
B | 0.1 | 1 | |
C | 0.8 | -0.8 | 1 |
若必须选择两个产品构建组
A. B、C组合是风险最佳对冲组合
B. A、C组合风险最小
C. A、B组合风险最小
D. A、C组合风险最分散
[填空题]有如下程序；
a=1: b=2: c=3
a=a+b：b=b+c：c=b+a
If a＜＞3 Or b＜＞3 Then
a=b-a：b=C-a：C=b+a
End If
Print a+b+c
运行后，输出的结果是 【15】 。
[单项选择]若a，b，c分别为△ABC的三边之长，则|a-b-c|+|b-c-a|-|c-a-b|=（）。
A. a+b+c
B. b+c-a
C. 3a-b-c
D. 3c-a-b
[填空题]若a+b+c，b+c-a，c+a-b，a+b-c依次成等比数列，公比为q，则q3+q2+q-1=______．
[单项选择]有A、B、C三种投资产品，其收益的相关系数如下：
| A | B | C |
A | 1 | | |
B | 0.1 | 1 | |
A. B、C组合是风险最佳对冲组合
B. A、C组合风险最小
C. A、B组合风险最小
D. A、C组合风险最分散
[填空题]设有关系R(A, B, C, D, E)，各属性函数依赖集合有FA→B, B→C, C→D, C→E若把关系R分解为R1(A, B, C) 和R2(C，D，E)，则R2属于第______范式。
[单项选择]化简(A-B-C) ∪(A-B) ∩C) ∪(ANB-C) ∪(A∩B∩C) = (62) 。
A. A∩B
B. B∩C
C. A
D. B
[填空题]有如下程序:
a=1:b=2:c=3
a=a+b:b=b+c:c=b+a
If a＜ ＞3 Or b＜ ＞3 Then
a=b-a:b=c-a:c=b+a
End If
Print a+b+c
运行后，输出的结果是 【15】 。
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