The analytic method for the free vibration of plane frame structure is presented.
介绍了一种平面杆系结构自由振动的解析解法。
The calculation method for breaced plane frame of parabolic type steel trestle was introduced in the paper and it was proved by the practical examples.
介绍抛物线式钢栈桥平联的计算方法，并通过实例予以验证。
Workpieces with the cutter location points on the same plane are usually milled by window-frame method by 2-axis NC machining with flat-end mill.
环切加工是常用的数控二轴联动铣削方式，用于加工工位在同一平面上的零件；
Workpieces with the cutter location points on the same plane are usually milled by window-frame method by 2-axis NC machining with flat-end mill.
环切加工是常用的数控二轴联动铣削方式，用于加工工位在同一平面上的零件；
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