用有限元方法，对双圆弧弧齿锥齿轮沿齿长方向齿根应力进行了计算。通过应力计算结果的分析，得出了凸、凹两齿侧应力沿齿长的分布规律。
Through the calculation of the finite element method(FEM) models for double circular arc profile spiral bevel gear, the stress changing pattern along the length of the tooth is obtained.
一项来自瑞典的研究表明长方形、中间有下凹的颈枕能增加睡眠质量，同时减少颈部酸痛。
One Swedish study found that neck pillows, which resemble a rectangle with a depression in the middle, can actually enhance the quality of your sleep as well as reduce neck pain.
一项来自瑞典的研究表明长方形、中间有下凹的颈枕能增加睡眠质量，同时减少颈部酸痛。
One Swedish study found that neck pillows, which resemble a rectangle with a depression in the middle, can actually enhance the quality of your sleep as well as reduce neck pain.
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