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GRE阅读备考资料汇总

2019-01-29 15:58:49来源:网络

  为了帮助大家高效备考GRE,新东方在线GRE频道为大家带来“GRE阅读备考资料汇总”,希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

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  GRE阅读备考资料汇总

  关于反射法过程的描述:

  In field practice , a subsurface is mapped by arranging a series of wave-train sources , such as..

  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 ... are combined to …

  Q2 alf have a significant effect on the signal detected by the seismic instruments EXCEPT

  A: unrelated wave 小列举有 B: placement of the seismic instruments

  C number of sources in the grid pattern D nature of the reflectivity of the rock interfaces

  E properties of rocks through which the wave train has traveled

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