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心中留:看岩芯好像是煤? (2012-07-29 10:46) :F(9"L
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yedc:灰岩较常见溶洞 ? (2012-08-05 22:11) j4vB`Gr]
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zy297238460:溶洞到不是常见,但是岩体中10-50cm的裂隙到是很多的!!! (2012-08-07 18:36) [KD}U-(Wg
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