必要而充分的条件是合外力矩能量小于最大限度的恢复能量，且合外力不等于零；
What is necessary is resultant moment energy is smaller than maximal rehabilitating energy and is not zero.
静态强度分析揭示了微型主轴轴承在外力矩作用下的应力分布规律和位移分布规律。
Static analysis determined the stresses and displacements in the bearing under all sort of typical work conditions.
恰当地引入了降落伞的附加质量和附加惯性矩，完整地分析了伞体和弹体所受的外力和外力矩，建立了由伞体和弹体组成的末敏弹系统二体运动模型。
The external forces and moments of the parachute and projectile are analyzed completely. A two body motion model of the TSP system, which is composed of the parachute and projectile, is established.
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.
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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