In this paper, some counter examples to the conclusions of singular solution and envelope in two textbooks of ordinary differential equation are given.
给出了两种常微分方程教材中关于奇解与包络关系结论的反例。
2
Apply to differential slip shaft what full-automatic loading and unloading coil stock, ensure the volume do not shift and loose while counter rotating.
适用于全自动装卸卷料的滑差轴，保证正反转时卷芯不移位，不松动。
3
The design of differential stress sensor with five magnetic pole based on counter magnetostriction effect of ferromagnetic materials is given.