在网络计划中，若某项工作的（）最小，则该工作必为关键工作。
A. 自由时差
B. 计划工期
C. 时间间隔
D. 总时差
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继承表示了对象间“（）”的关系。
A. is-a
B. is-son
C. is-object
D. is-one
Which of the following elements of Davis' book is the author in agreement with
A. The Southern colonies shared a common culture.
B. The Northern colonies shared a homogeneous culture.
C. Acquisitiveness was a characteristic unique to the South during the Colonial period.
D. There were significant differences between Puritan and Southern culture during the Colonial period.
A major goal of the state travel agency is to ______ more people to visit its country at the turn of the century.
A. reduce
B. attract
C. stimulate
D. induce
计算机网络系统由两个子网构成，它们是（）。
A. 有线网和无线网
B. 通信子网和资源子网
C. 数据子网和通信子网
D. 点对点网和广播式网
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