acid mining waste water
water retention admixture
water retention ability
water retention
保水
保
保水能力
饱水性
水分保持
保水性
保水性能
保水率
保水度
持水力
水停
持水能力
涵养水源
保水剂
水份保持
Water Resource Protection in Coal Mining
Water quality of mining area
water prevention and draining during construction
water preserving mining
water level during dry period
water jet assisted mining
water diversion during winter
water dissolving mining
water deficiency during flowering and fruiting period
water controlled coal mining
water conservative coal mining
WATER CONSERVATION MINING