搜题请搜索小程序“爱下问搜题”
问题 问答题

陈胜、吴广为什么要起义？请说出它的根本原因和直接原因。这次起义在中国历史上有什么意义？

__________________________________________________________________________

答案

原因：根本原因在于秦朝残暴的统治，直接逼使陈胜、吴广揭竿而起的是秦朝严苛的刑法制度。起义的直接原因是因为大雨冲毁道路致使兵役误期。意义：是中国历史上第一次大规模的农民起义，其革命首创精神，鼓舞了后世千百万劳动人民起来反抗残暴的统治。

单项选择题

蜗杆蜗轮适用于（）运动的传递机构中。

A.减速

B.增速

C.等速

D.增或减速
查看答案
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 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.
查看答案