并且证明，法面双圆弧齿轮的每一段端面齿廓都是对应椭圆曲线段在相对运动中的包络曲线。
Moreover, the extreme shape of the normal double circle gearing proves to be the involved curve of the corresponding ellipse.
笔者通过对大量事故样本的观察和分析，发现应用双变量区间过滤法，即变步长变区间过滤法进行事故多发段判别更符合样本特性并具有良好的精度。
The authors observe and analyze a lot of accident data, find that using double variables filtration method to identify APL according to data traits has good precision.
应用数值模拟方法研究了在盾构法修建隧道的基础上拆除管片修建渡线隧道中双联拱段方案的可行性，研究表明双联拱方案是可行的；
The construction plan of double-joined arch is validated using numerical simulation when dilapidating segments to construct single connecting tunnel between two shield-driven tunnels in this paper.
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