[单项选择]（）means to provide facility for customer’s need or inquiry and arrange it.
A. service
B. business
C. customer service
D. making money

[单项选择]（） is meant to provide facility for customer s need or inquiry and arrange it.
A. Service  
B. Business  
C. Customer service  
D. Making money

[单项选择]

For  (1) service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new (2) for every packet sent. Instead,when a connection is established, a route from the(3) machine to the destination machine is chosen as part of the connection setup and stored in tables inside the (4) . That route is used for all traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-oriented service, each packet carries an (5) telling which virtual circuit it belongs to.

空白（1）处应选择（）
A. connectionless
B. connection-oriented
C. datagram
D. telegram

[单项选择]

Creating WBS means subdividing the major project deliverables into smaller components until the deliverables are defined to the level（）

A. independentresource
B. individualworkload
C. workmilestone
D. workpackage

[多项选择]K-means算法叙述正确的是（）
A. 在K-means算法中K是事先给定的，这个K值的选定是非常难以估计的
B. 在K-means算法中，首先需要根据初始聚类中心来确定一个初始划分，然后对初始划分进行优化
C. 对于一个类中的每个对象，在其给定半径的领域中包含的对象不能少于某一给定的最小数目
D. 从K-means算法框架可以看出，该算法需要不断地进行样本分类调整，不断地计算调整后的新的聚类中心，因此当数据量非常大时，算法的时间开销是非常大的

[单项选择]K-means算法的缺点不包括（）
A. K必须是事先给定的
B. 选择初始聚类中心
C. 对于“噪声”和孤立点数据是敏感的
D. 可伸缩、高效

[单项选择]

（）means that every project has a definite beginning and a definite end.

A. Projectphase
B. Unique
C. Temporary
D. Closure

[多项选择]K-means算法的叙述正确的是（）
A. 在K-means算法中K是事先给定的，这个K值的选定是非常难以估计的
B. 在K-means算法中，首先需要根据初始聚类中心来确定一个初始划分，然后对初始划分进行优化
C. 对于一个类中的每个对象，在其给定半径的领域中包含的对象不能少于某一给定的最小数目的新的聚类心，因此当数据量非常大时，算法的时间开销是非常大的

[单项选择]（）means saying sorry to some one that you've hurt them or caused trouble for them.
A. Delay
B. Apologize
C. Inconvenience
D. Maintenance

[单项选择]I need （）more volunteers to help clean the classroom.
A. none
B. any
C. few
D. some

[单项选择]（）doesn’t need to change package of goods or to stop in any place between the origin and destination
A. Through transport  
B. Transfer transport  
C. Combined transport  

[单项选择]As we are（）urgent need of Art.No.5609，please ship our order with out delay.
A. on
B. of
C. in
D. to