X dX Y X式（2）式（1）称为弧弹性（Arc Elasticity）它只 是近似地测定函数在某一区间平均弹性；式（2） 称为点弹性（Point Elasticity），它可以精确地 测定函数在某一点（X,Y）的弹...
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To choose the point elasticity or the arc elasticity?
选择点弹性还是弧弹性？
First, we seek the origin of the elasticity and the invention of the point elasticity and the arc elasticity. We also search for their original paper respectively.
文中首先寻找弹性的由来始末，以及点弹性和弧弹性的产生过程，并各自找出它们的原始文献。
Determination of the bending strength of gear teeth of circular-arc profile gear is very difficult due to many unknown factors, which would be also a complicated problem in the field of elasticity.
确定圆弧形齿轮轮齿强度将涉及到很多因素。就是在弹性理论上来看也是一个复杂的课题。
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