The drag force decreases with decreasing of the surface area between the hull and water.
拖曳力的下降,下降的表面积之间的船体和水。
Decreasing the particle size is usually conducted by applying a shearing force.
通常使用剪切力减小颗粒粒度。
In the compound process of ultrasonic vibration and grain machining, the discontinuous grinding mechanism caused by ultrasonic vibration is the main factor decreasing normal grinding force.
深入研究了超声振动和磨粒切削的复合过程,指出超声振动形成的断续磨削机制是降低法向磨削力的主要原因。
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