The billet was at first pre formed and close-die forged on different hydraulic presses and then the forging was rolled, punched and bended. Such a production line will be the most efficient.
钢坯先在一台水压机上预成形制坯，再在另一台压机上模锻，经轧制扩径后冲孔压弯。
The hydraulic characteristics of the smooth spillway, the stepped spillway and the pre-aerator stepped spillway have been studied respectively.
对光滑溢洪道、阶梯溢洪道和前置掺气坎式阶梯溢洪道水力特性进行了对比研究。
The real effect the Hydraulic load does for the effect of water biological pre-treatment by elastic packing.
水力负荷的大小对于弹性填料生物预处理净化水质的效果随不同项目有不同的影响。
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