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问题 选择题
下列命题中是假命题的是（　　）
A．若
a
•
b
=0（
a
≠
0
，
b
≠
0
），则
a
⊥
b
B．若|
a
|=|
b
|，则
a
=
b
C．若ac2＞bc2，则a＞bD．5＞3
答案

A．因为

a
≠
0
，
b
≠
0
，所以由
a
•
b
=|
a
||
b
|cos＜
a
，
b
＞=0，得cos＜
a
，
b
＞=0，即＜
a
，
b
＞=
π
2
，所以
a
⊥
b
成立．所以A为真命题．

B．若|

a
|=|
b
|，只能说明
a
与
b
长度一样．
a
=
b
不一定成立．所以B为假命题．

C．若ac2＞bc2，则c2≠0，根据不等式的性质，必有a＞b，所以C为真命题．

D.5＞3显然成立，所以D是真命题．

故选B．

单项选择题

You are assigned as the project manager to a project which is executed for a customer under FP contract. Your customer informed you this morning that they insist on certain "refinements" of the project scope. You agree that the requested actions make really sense to the project, but believe that they constitute a major change increasing the project scope. What should you do next

A) Accept the request of the customer. Diligently document the additional costs and working hours spent by yourself and the team on the implementation of the change and invoice these to the customer at appropriate rates.
B) Perform earned value analysis to assess the current status of the project and get all the numbers you need to communicate the case to the change control board which then will have to make the best decision regarding the customer request.
C) Check the contract, the project charter, the scope statement and other documents related to the project and the contract. Assess the impacts of the scope change. Then discuss the situation with the project sponsor and the change control board.
D) Talk to the project sales department and find a joint solution with them how to best reject the request considering the commercial and strategic value of the customer to the organization you are working for.
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问答题 简答题

简述信息技术与信息系统在信息资源管理中发挥的作用。
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