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密闭抽采法的特点有：

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密闭抽采法的特点有：

A.密闭墙厚1~3m，灌以砂、粉尘、泥浆等材料，保证严密不漏风

B.抽采管穿过回风巷的密闭墙、伸入采空区内进行抽采，伸入深度以10m以上为好

C.应对密闭内的气体成分、浓度、抽采负压等参数经常进行监测与控制

D.管壁穿有小孔并用沙网包好，防止抽故中发生堵塞现象

参考答案:

答案：密闭墙厚1~3m，灌以砂、粉尘、泥浆等材料，保证严密不漏风；抽采管穿过回风巷的密闭墙、伸入采空区内进行抽采，伸入深度以10m以上为好；应对密闭内的气体成分、浓度、抽采负压等参数经常进行监测与控制

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