轴

分配阀主轴采用高压双注油双道密封结构，保证了润滑油到位充足，用寿命大幅度提高，并且润滑油消耗量极少，节省油料，降低了运行成本。

principal and interest

principal vector

principal disjunctive normal form

principal quantum number

principal component analysis

vice-principal

principal foci

principal focus