The main cause of error of strain measurement using electronic extensometer and its effects on the strength measurement in tensile tests of metallic materials was analyzed.

分析了电子引伸计应变测量误差形成的主要原因，以及对金属材料拉伸试验强度测试的影响，介绍了引伸计使用中的一些经验和注意事项。

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This paper presents a high efficient process method of a steep lead tread of coupling screw and studies the profile accuracy by using electronic computer and arrives at the profile error curve.

介绍了一种大导程波形联结螺纹的高效加工方法，借助计算机进行了螺纹牙形的精度分析，得出了齿形误差曲线。

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Instead of using optics for the entire retrieval process, they use it to guide a second, electronic (and error-free) search of a large, conventionally stored database.

ECONOMIST: Optical recognition