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。
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。
The design of differential stress sensor with five magnetic pole based on counter magnetostriction effect of ferromagnetic materials is given.
磁致伸缩逆效应是稀土超磁致伸缩材料的一个重要应用特性，应用磁致伸缩逆效应可以制作超磁致伸缩力传感器。
The design of differential stress sensor with five magnetic pole based on counter magnetostriction effect of ferromagnetic materials is given.
磁致伸缩逆效应是稀土超磁致伸缩材料的一个重要应用特性，应用磁致伸缩逆效应可以制作超磁致伸缩力传感器。
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