地震成组活动
Grouping earthquake activity
Seismicity in groups
缸套-活塞组
cylinder liner-piston group
Cylinder-piston group
Cylinder-piston Ring
活塞组件的动力学分析
Dynamic Analysis of Piston Components
活塞组瞬态摩擦力
Instantaneous Friction Force of Piston Assembly
连杆和活塞组件
connecting rod and piston group
强震成组活动
Grouping activities of strong earthquakes
Grouping activity of strong earthquake
Grouped strong earthquake activity
group strong earthquakes