The lower envelopingcurve of the shear strength control zone can be found from the analysis of shear and flexural strength of reinforced concrete member.
通过对钢筋混凝土构件抗剪强度和抗弯强度关系的分析，能找出剪切强度控制区的下包络线。
2
The outspread principle of involute and enveloping principle of curve is applied to build the model of double involutes gear contrate profile, the veracity is verified by the data.
运用渐开线展开和曲线包络原理，建立了双渐开线齿轮端面齿廓数学模型，用数据验证了模型的准确性。
3
The double curve of the roof is formed by a textile membrane enveloping the whole building in one homogeneous sweep.