某工程代号网络计划如下图所示，图中起“断路”作用的箭线是()。
A. 3—5
B. 5—6
C. 6—7
D. 6—8
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Which of the following statements of American families in 19th century can be inferred from the passage？
A. Family members became more economically dependent on each other.
B. The percentage of families involved in industrial work declined dramatically.
C. Family members became mom emotionally bonded to one another.
D. Family members spent an increasing amount of time working with each other.
The costs of a Computer-Based Recording System are lower than that of a component-based Hardware System.
A. Y
B. N
C. NG
A．Fill some forms.B．Have a test drive in the Porsche.C．Have lunch with the woman.D．Try
A. Fill some forms.
B. Have a test drive in the Porsche.
C. Have lunch with the woman.
D. Try his luck in another car rental company.
大型建设工程项目的结构分析是根据编制总进度纲要的需要，将整个项目进行逐层分解，并确立相应的工作目录，如：将每一个子系统分解为若干个子项目；则对应的是()。
A. 一级工作任务目录
B. 二级工作任务目录
C. 三级工作任务目录
D. 四级工作任务目录
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