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. 最后一句the surface,where it is recorded by seismic instruments. 这里是定语从句还是状语从句... 若是定语从句是非限制性的么
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发表于 2012-10-22 17:25:44
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