The first frequency method of estimating the fatigue serviceability on small and medium span railway concrete bridge is discussed in this paper through three piece test beam under fatigue load.
通过三片模拟梁试验实测结果，探讨了基频法评估铁路桥梁疲劳使用性能的可行性。
The effect of span between two cores of lime-titania type carbon-steel electrode was investigated using the method of overlay welding on the plate work-piece and high speed camera system.
采用平板堆焊的方法及高速摄像系统，研究了双电极钛钙型碳钢焊条的焊芯间距对焊接工艺和电弧形态的影响。
Long-term use can effectively extend the life span of bearings, it is a good helper for the dentists to maintenance the hand-piece.
长期使用可有效延长轴承的寿命，是牙科医师保养手机的最好帮手。
Long-term use can effectively extend the life span of bearings, it is a good helper for the dentists to maintenance the hand-piece.
长期使用可有效延长轴承的寿命，是牙科医师保养手机的最好帮手。
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