有效声孔径。电极厚度以及器件的声光衍射效率、偏转角度、声驱动功率等参数。
Meanwhile, such parameters as diffraction efficiency, deflection Angle and driving power of device have been analyzed and computed theoretically.
稀土永磁同步电动机具有效率高、功率因数高的特点，是一种高效节能产品。
High efficiency and high power factor are characteristic of rare earth and permanent magnetism and synchronous motor. lt is a energy saving product.
正确计算抽油机井的有效功率是计算抽油机井系统效率的关键。
Accurate calculating of the effective horsepower of pumping unit is the key to calculating the pumping unit system efficiency.
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