principal vector
主电机矢量变频器 main motor vector inverter
矢量主轴驱动装置 Vector Spindle Drive
在这种情况下，为了解的唯一性，证明了必须另外给出每一边界围线上外力的主矢量与主力矩。
In such case, it is proved that, for the unique existence of solution, there must be given in addition the principal vector and the principal moment of the external forces on each boundary contour.
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