首页
登录
职称英语
Since ancient times, the destructive effects of earthquakes on human lives a
Since ancient times, the destructive effects of earthquakes on human lives a
游客
2023-07-06
66
管理
问题
Since ancient times, the destructive effects of earthquakes on human lives and property have encouraged the search for reliable methods of earthquake prediction. This challenge remains and modern scientists continue to search for reliable methods to determine the time, place and intensity of individual quakes. One prediction technique involves an analysis of the recurrence(重现)rates of earthquakes as indicators of future activity. Earthquakes are concentrated in certain areas of the world which are subject to constant movements of earth’s plates and it is in these areas that scientists focus their investigations.
This search for pre-earthquake phenomena has received particular attention. In contrast to the ancient Greeks and Romans, who relied on the crying of dogs as a warning sign, modern scientists have focused on physical evidence for a coming earthquake. Evidence of plate strain can be found by measuring relative movements, while chemical changes also offer signals for scientists.
Analysis of the changes in magnetic properties and conductivity(传导性)of rocks provides further data for prediction. The electrical and magnetic properties of crustal(地壳的)rocks are particularly sensitive to strain. The conductivity of crustal rock is determined by the degree to which the rock is soaked with fluid and the electrolytic properties of those fluids. Before large earthquakes, small fractures develop in rocks, which change the quantity of fluid present. These changes can be measured and provide useful data. However, similar changes in the fluid-bearing capacity of rock can occur as a result of other factors such as changes in the water table, and therefore this technique is not entirely reliable.
The ancient belief that the behavior of birds, cats and dogs provides evidence of inevitable earthquakes has recently gained credence as a result of tests carried out in California. It has been shown that changes take place in the metabolic(新陈代谢的)rates of these animals which correlate with subsequent seismic activity. It is assumed that the animals are sensitive to the seismic waves which precede major quakes. In zones where earthquakes are known to occur, improved construction techniques can significantly reduce the effects of seismic waves. If more accurate information regarding the time and intensity were available, governments could take even more effective measures to reduce the impact on human lives. If, however, an entirely accurate prediction technique became available, there would be significant social and political implications. [br] A disadvantage of fluid measuring is that ______
选项
A、changes in quantity of fluid in rocks can be caused by other factors except strain
B、present scientific instruments are not able to provide precise measurement
C、the electrical properties of rocks also change the fluid capacity of rocks
D、fractures in rocks make accurate measurement absolutely impossible
答案
A
解析
推理判断题。定位句提到,其他因素也会导致岩石含水量的变化,比如地下水位的变化。因此这种预测办法也不是完全可靠的。由此可以推知,不可靠就是这种液体测量办法的缺陷,其原因就是A)“岩石的含水量的变化可能是由除压力外的其他因素造成的”,故为正确答案。
转载请注明原文地址:http://tihaiku.com/zcyy/2814087.html
相关试题推荐
Isitpossibletopersuademankindtolivewithoutwar?Warisanancientin
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
HistoryofAmericanImmigrationA)Ancientpeoplesonlyloose
HistoryofAmericanImmigrationA)Ancientpeoplesonlyloose
HistoryofAmericanImmigrationA)Ancientpeoplesonlyloose
HistoryofAmericanImmigrationA)Ancientpeoplesonlyloose
HistoryofAmericanImmigrationA)Ancientpeoplesonlyloose
HistoryofAmericanImmigrationA)Ancientpeoplesonlyloose
HistoryofAmericanImmigrationA)Ancientpeoplesonlyloose
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
随机试题
PassageTwoSoothe.由题干关键词定位到第七段,第七段末句指出,法院首先可能不会将责任归咎到你身上,而这或许能帮助“assuage”一些痛苦但不能
[originaltext]M:MayIcomein?W:Yes,ofcourse.M:Hello,Kate.WhereisJan
女性,65岁,咳嗽、咳痰伴喘息30余年,加重1周,痰白色,量较多,2天来高热、嗜
幼儿进入小学后的主要任务是学习,因此幼儿没必要学习生活自理( )
心理的源泉和内容是(),心理的器官是() A、客观现实B、人脑
以下有关丸剂的叙述,哪一项是错误的A.适用范围广 B.制法简便 C.可
独立避雷针导通电阻低于500mΩ时应进行校核测试。其他部分导通电阻大于50mΩ时
某人购买一套建筑面积120平方米,套内建筑面积100平方米,套内建筑面积单价50
劳动标准法包括()。A.正员标准法 B.工作时间法 C.职业标准法
下列关于劳动争议处理途径的方法,正确的是( ) A.当事人可以协商解决劳动争
最新回复
(
0
)