Through the theoretical and experimental study on rock breaking by submerged water jetting, taking rock breaking efficiency as goal function, the optimum jetting pressure was acquired to break rock.
本文通过对淹没射流破碎岩石的理论及实验研究，以破岩效率作为目标函数，得到射流破岩的最优压力条件。
It takes just a few minutes. That little releasing break will help you get through the day without any stress or pressure.
在这些短暂的休息中做释放会帮助你轻轻松松、毫无压力地度过每一天。
It takes just a few minutes. That little releasing break will help you get through the day without any stress or pressure.
在这些短暂的休息中做释放会帮助你轻轻松松、毫无压力地度过每一天。
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