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Shock and Vibration
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2020
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Article
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Tab 4
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Research Article
Study of the Law of Hydraulically Punched Boreholes on Effective Gas Extraction Radius under Different Coal Outputs
Table 4
The equivalent aperture of per unit coal output.
Coal output (t/m)
Equivalent aperture (m)
0.5
0.70
1.0
1.02
1.5
1.24