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TEACHING-AID DEVICE ON ENGINEERING GEODESYCES
TEACHING-AID DEVICE ON ENGINEERING GEODESYCES
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机译:工程地质学教学辅助设备
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摘要
the invention позвол ет expand demonstration ability training of engineering surveying. model of hollow beams 1 is filled with токопро - вод щей liquid 2. at the top of the hour
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