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Advances in Civil Engineering
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2021
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Article
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Fig 3
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Research Article
Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal
Figure 3
Schematic diagram of ground stress measuring point layout. (a) Point 1. (b) Point 2. (c) Point 3.
(a)
(b)
(c)