试题与答案

请根据上表完成此项目的前导图(单代号网络图),表明各活动之间的逻辑关系,并指出关键路

题型:问答题 论述题

题目:

请根据上表完成此项目的前导图(单代号网络图),表明各活动之间的逻辑关系,并指出关键路径和项目工期。结点用以下样图标识。

图例: 

ES:最早开始时间 EF:最早结束时间 

LS:最迟开始时间 LF:最迟完成时间 

DU:工作历时 ID:工作代号

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A

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题型:单项选择题

Since life began eons ago, thousands of creatures have come and gone. Some, such as the dinosaurs, became extinct due to naturally changing ecologic conditions. More recent threats to life forms are humans and their activities. Man has drained marshes, burned prairies, dammed and diverted rivers. Some of the more recent casualties of man’s expansion have been the dodo, great auk, passenger pigeon, Irish elk, and Steller’s sea cow. Sadly, we can no longer attribute the increasing decline in our wild animals and plant species to "natural" processes. Many species are dying out because of exploitation, habitat alteration or destruction, pollution, or the introduction of new species of plants and animals to an area. As mandated by Congress, protecting endangered species, and restoring them to the point where their existence is no longer jeopardized, is the primary objective of the U.S. Fish and Wilidlife Service’s Endangered Species Program.

Which of the following is NOT a cause of increasing decline of wild animal population

A.Exploitation

B.Pollution

C.Habitat alteration

D.Congressional law

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