现场应用表明，该技术能有效地防止煤层坍塌，减少井下复杂情况及事故。
Field applications show that this technique can effectively prevent coal beds sloughing and decrease hole problems and drilling accidents.
现场应用表明，该技术能有效地防止煤层坍塌，减少井下复杂情况及事故。
Field applications show that this technique can effectively prevent coal beds sloughing and decrease hole problems and drilling accidents.
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