某工程项目的进度计划如下面双代号网络计划所示(时间单位：周)。

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问题单项选择题

在该网络计划中，工作F的总时差为()周。

A.2

B.3

C.4

D.5

答案

参考答案：C

解析：I为关键工作，所以F的总时差=I的开始时间-F的最早完成时间=13-（4+5）=4（天）。

单项选择题

根据《建筑基坑支护技术规程》8.2.5要求，地下管线沉降观测点水平间距不宜大于（）m。

A.10

B.15

C.20

D.25

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单项选择题

When butterfat was considered nutritious and healthful, a law was enacted requiring that manufacturers use the term "imitation butter" to indicate butter whose butterfat content had been diminished through the addition of water. Today, it is known that the high cholesterol content of butterfat makes it harmful to human health. Since the public should be encouraged to eat foods with lower rather than higher butterfat content and since the term "imitation" with its connotations of falsity deters many people from purchasing products so designated, manufacturers who wish to give reduced-butterfat butter the more appealing name of "lite butter" should be allowed to do so.
Which one of the following, if true, most seriously undermines the argument

A．The manufacturers who prefer to use the word "lite" instead of "imitation" are motivated principally by the financial interest of their stockholders.

B．The manufacturers who wish to call their product "fire butter" plan to change the composition of the product so that it contains more water than it now does.

C．Some individuals who need to reduce their intake of cholesterol are not deterred from using the reduced-butterfat product by the negative connotations of the term "imitation."

D．Cholesterol is only one of many factors that contribute to the types of health problems with which the consumption of excessive amounts of cholesterol is often associated.

E．(E) Most people deterred from eating "imitation butter" because of its name choose alternatives with a lower butterfat content than this product has.

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