water pre meaning in English

水压机

Study of determination method on water infusion parameters of water pre - infusion treating top coal in fully mechanized sub - level caving mining
综放开采预注水处理顶煤的注水参数确定方法研究
It is a very important problem for steel - iron - making enterprise to remove the sulfur efficiently , improve the quality of steel and design the new products , however , the traditional iron water pre - desulfuration method based on manual control causes the instability in the process , which harms the quality of steel and increases the production cost
在钢铁企业中，如何降低钢材中的硫含量，提高钢材质量，开发新品种是钢铁生产的一个重要课题。传统的铁水预脱硫主要采用人工控制，难以保证脱硫操作的稳定性，导致钢产品质量波动大，脱硫成本增加。