大规模的粉煤灰的充填会产生高碱性的矿山废水，与此同时，它也减少流向地表水系的废水中的污染负荷。
Deposing of fly ash is in a great degree connected with development of high salinity mine drainage water, at the same time it decreases the contamination load carried away to the surface waters.
采用多级阶梯加砂压裂技术，使裂缝充填合理，同时保证压裂施工成功。
It makes fissure occupation in reason and at the same time guarantee the construction success by using multistage ladder sand-franc technique.
同时，内浇道充型速度和内浇道尺寸对压铸件充填过程影响很大，合理的设置可以减少涡流和卷气，得到高质量的压铸件。
At the same time, gate entry velocity and gate dimension have great influence on the mold filling process, and high quality metal castings could be obtained …
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