信息产业的管理体制的基本模式有（）A．集中式 B．集中－分散式 C．分散式 D．网状

下列是一些常用的危险品图标，装运浓硫酸的箱子应贴的图标是（　　）

A．

    爆炸性

B．

    易燃性

C．

     毒性

D．

    腐蚀性

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 Wildlife 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.

建立题39线性规划问题的标准形式，以原点为基础求出基础可行解，并以单纯形法优化求解。

企业财产保险的费率分为基本险费率和( )两部分。

A．仓储险费率
B．普通险费率
C．工业险费率
D．附加险费率

根据《合伙企业法》的规定，合伙人对合伙企业的债务应当承担（）

A.有限按份责任

B.有限连带责任

C.无限按份责任

D.无限连带责任