The flat in the supporting axle of the train wheel side frame is very difficult to process with ordinary milling lathe, and processing efficiency is very low.
火车车轮侧架支撑轮轴处的平面加工用普通铣床加工很困难，而且效率很低。
This text is to compare Frensnel s zones plate with ordinary lens, on the axle point of light intension and focal distance as well as their difference in use.
当光通过菲涅耳半波带与普通透镜时，可发现在轴上点的光强、焦距以及用途上的不同。
This paper mainly introduces the structure and working principle of double drive axle, analyzes ordinary failure and presents the solving method and using notice.
本文主要介绍双联驱动桥的结构及工作原理，分析常见故障，提出排除方法及使用注意事项。
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