The general inference and demonstration of the equilibrium problem of particle system are carried on, the full and necessary conditions are given while the constraint is ideal, linear and scleronomic.
本文就质点系平衡问题进行了一般性的推证，给出了当约束是理想、线性定常约束时的质点系平衡的充要条件。
Responsibility is constraint, people living in the world, is not like, on social responsibility should become our ideal of life end-result.
责任就是约束，人活在世上，不是为所欲为，对社会的责任应当成为我们人生理想的归宿。
Explicit formulas for the constraint admittance matrix and the nodal short-circuit current source vector of networks containing ideal voltage sources are derived by nodal approach.
本文用节点法分析了含理想电压源的网络，从网络的不含源导纳矩阵获得了含源网络的约束导纳矩阵以及节点短路电流源向量的公式。
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