京北的玫瑰园命运维艰，梁希森接手之后，卧薪尝胆，大拆大改。
Beijing North Rose Garden fate Victoria together, Liangxisen over, enduring hardships to accomplish great dismantling changed.
本文讨论受到多频率约束的铁木森柯梁和尤拉梁的最小重量设计问题。
The present paper discusses the minimum weight design problem for Timoshenko and Euler beams subjected to multifrequency constraints.
系统地介绍了采用斯蒂芬森链对常规型游梁机进行六杆式改造的图解方法。
The article introduces systematically the schematic method for the six-bar modification of a conventional pumping unit by use of Stephenson' chain.
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