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GRE阅读模拟在线练习附答案七十三

2018-06-22 17:00:00来源:网络

  为了辅助大家更好地备考GRE阅读考试,新东方在线托福网为大家整理了一些模拟练习题,分享给大家,希望对大家接下里的GRE阅读备考,有更好的帮助。

点击查看》》》【GRE阅读真题在线练习附答案汇总】

  Because of its accuracy in outlining the Earth’s subsurface, the seismic-reflection method remains the most important tool in the search for petroleum reserves.In field practice, a subsurface is mapped by arranging a series of wave-train sources, such as small dynamite explosions, in a grid pattern. As each source is activated, it generates a wave train that moves downward at a speed determined uniquely by the rock’s elastic characteristics. As rock interfaces are crossed, the elastic characteristics encountered generally change abruptly, which causes part of the energy to be reflected back to the surface, where it is recorded by seismic instruments. The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave trains, and for multiple reflections from the rock interfaces. Then the data acquired at each of the specific source locations are combined to generate a physical profile of the subsurface, which can eventually be used to select targets for drilling.

  Select the sentence that indicates factors other than the properties of the rock that have a significant effect on the signal detected by the seismic instruments in the seismic-reflection method

  正确答案:The seismic records must be processed to correct for positional differences between the source and the receiver, for unrelated wave trains, and for multiple reflections from the rock interfaces.

  以上就是关于“GRE阅读模拟在线练习附答案七十三”的内容,更多精彩内容,请关注GRE频道!


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