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井群降水的最大特点是降水面积大．可以在建筑物较密集的区域内降水、同时可以严格的监测．控制出水含砂量．防止周围由于含砂量超标准、产生建筑物的不均匀下沉。
The most important feature of well group precipitation is the large precipitation area. Precipitation in densely populated areas can be monitored at the same time. Control the water content of sand. Prevents the surrounding sinking due to excessive sand content and uneven building construction.