利用互易电路支路阻抗矩阵对称性，构造回路阻抗矩阵也对称的回路电流方程，得出一种证明互易定理的直观方。
With symmetry of branch impedance matrix in reciprocity network the loop current equation that the loop impedance matrix is symmetrical is presented.
描述了有向无回路图的构造性定义，指出问题一定有不超过所有任务执行时间总和的解。
A constructible definition of the directed acyclic graph was described, and the reason why exists a solution that does not exceed the total execution time of all tasks was explained.
油压系统亦为内藏式，不占空间，回路特别设计，构造精简，故障少，保养容易。
The hydraulic system is installed inhoused which could save room space while its loop is specially designed, all contributing to simple structure, little fault and easy maintainance.
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