These show that vegetation dam can reduce starting drag force and starting frequency of sediment in upper reaches. And can make athletic sediment deposit.
说明植物坝可以减小泥沙的起动拖曳力，降低上游泥沙的起动频率，并能使运动的泥沙在坝上游沉积下来。
The control effect of electromagnetic force on cylinder wake, lift force and drag force , which was caused by alternating current, is related to its frequency.
而交流电所产生的电磁力对于绕流涡街、升力、阻力的控制作用，则与所使用的频率有关。
Based on the G-M system contrast to the system of frequency conversion, the paper introduces the improvement of advocate-drag system of dragon-planer of transducer of B2012A and PLC.
在G - M系统和变频调速系统进行比较的基础上，介绍了基于PLC、变频器的B2012A型龙门刨床主拖动系统的改造。
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