地震成组活动
Seismicity in groups
Grouping earthquake activity
缸套-活塞组
Cylinder-piston Ring
Cylinder-piston group
cylinder liner-piston group
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
group strong earthquakes
Grouped strong earthquake activity