Two design strategies that three-way valve control unsymmetrical cylinder and four way valve control symmetrical cylinder were analyzed from principle and system structure aspects.
对船用舵机泵控系统中位置控制单元的三通阀控制非对称缸和四通阀控制对称缸的两种设计方案进行了理论分析和系统结构分析。
According to new observations, it can be proved quantitatively that a mode of eight major planets of the Solar System is a symmetrical structure: four terrestrial planets and the asteroid belt;
根据最新的观测结果,作者定量论证了太阳系的八大行星模式:它是对称的四个类地行星和小行星带;
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