Research Article

Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling

Figure 12

The cumulative distribution of particle size after the tests of single particle coal sample. (a) Original size: 1−3 mm. (b) Original size: 3-4 mm. (c) Original size: 4-5 mm. (d) Original size: 5-6 mm. (e) Original size: 6-7 mm. (f) Original size: 7-8 mm.
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