ernal force 外力 vector n. 向量, 矢量 the vector sum object n.物体,物品,实物;对象 opposite adj.相反的,相对的, 对面的,对立的 friction n. 摩擦, 摩擦力 friction factor 摩擦系数 torque n. 扭矩, 转矩 torque force 扭力 torque moment 转(扭)矩 moment n. 矩,动量 magnetic moment 磁矩 moment of inertia n.惯性(力)矩, 转动惯量 moment about point M 对M的矩 equivalent adj.相等的,相当的n.等价物,相等物 twisting n.扭曲 rotate v.(使)旋转 pivot n. 枢轴, 支点 product n.乘积
①A typical DC generator or motor usually consists of an armature core, an air gap, poles, and a yoke which form the magnetic circuit; an armature winding, a field winding, brushes and a commutator which form the electric circuit; and a frame, end bells, bearings, brush supports and a shaft which provide the mechanical support.
二极管是一种基本的电子元件。它限制电流在一个方向上 流动的能力是实际上每个电子电路生产中所依赖的关键性 质,从最小的电源到最大的工业过程控制器。