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
2024-02-06
43
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 believe that the behavior of birds, cats and dogs provides evidence of inevitable earthquakes has recently been attended as a result of tests carried out in California. It has been shown that changes taking place in the metabolic(新陈代谢的)rates of these animals 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 life, 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 other than strain
B、present scientific instruments are not able to provide precise measurement
C、the electrical properties of the rock itself also change the fluid capacity of rocks
D、fractures in these rocks are often so serious that accurate measurement is impossible
答案
A
解析
细节题。短文第三段最后一句指出However,similar changes in the fluid,bearing capacity of rock can occur as a result of other factors such as changes in thewater table,and therefore this technique is not entirely reliable.即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。因此这种方法也不是完全可靠的。故选项A正确。
转载请注明原文地址:https://tihaiku.com/zcyy/3426647.html
相关试题推荐
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
ImaginebeingaslaveinancientRome.Nowrememberbeingone.Thesecondta
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Sinceancienttimes,thedestructiveeffectsofearthquakesonhumanlivesa
Isitpossibletopersuademankindtolivewithoutwar?Warisanancientin
Isitpossibletopersuademankindtolivewithoutwar?Warisanancientin
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
[originaltext]Inancienttimesthemostimportantexaminationswerespoken,
随机试题
TheOriginofMoneyIntheearlieststagesofman’sd
Peopleinsunny,outdoorsystates—Louisiana,Hawaii,Florida—saytheyareth
下列属于营养改善项目的是( )。A.分析营养问题 B.确定项目目标 C.执
医疗事故的预防
与一般财务审计以验证企业财务报表真实性为目的不同,财务尽职调查强调发现企业的潜在
建设单位应当将大型的人员密集场所和其他特殊建筑工程的消防设计文件报送公安机关消防
对下列哪些选项中的情况,行政机关应当举行听证?()A.某市因城市建设需将一
以下有关解热镇痛药用于镇痛的健康提示中,正确的是A.对钝痛有较好的镇痛效果 B
根据物权法律制度的规定,以下列权利出质时,质权可以自权利凭证交付时设立的是()
(2020年真题)根据《环境影响评价技术导则地表水环境》,确定水文要素影响型建设
最新回复
(
0
)