Inadequate submergence can result in pre-rotation of the water in the wet-well, resulting in the formation of strong free-surface air core vortices and the entrance of air into the pump suction inlet.
潜水不恰当可能导致湿井内的水预旋转，导致形成强烈的自由表面空气中心漩涡，并使得空气进入泵的吸入进口管道。
This paper presents a method of providing a virtual support for the rotor to assure the meshing stability of a pair of a pre determined spiral bevel gears in rotation.
提出一种在转子上设置虚拟支承的方法，以保证弧齿锥齿轮的啮合稳定性，并采用传递矩阵法，建立了弧齿锥齿轮-转子系统的振动模型。
It is necessery that the total consumptive use of water in the rotation period is equal to the total effective precipitation(pre- cipitation minus runoff depth)in the loess hilly region.
在黄土丘陵区要求林草与农作物地在轮作周期内的总耗水量与有效雨量（降雨量与径流深之差）持平。
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