This article mainly introduces the method that adopts gear caliper to measure the median diameter normal tooth thickness of double-line trapezoidal thread.

本文主要介绍了采用齿轮卡尺测量双线梯形螺纹中径法向齿厚的方法，同时也测量出螺距产生的误差。

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This has enabled designers to continue with the trend of reducing the steering wheel size, with the typical item now being about half the diameter of that of a normal road car.

这也使得设计师可以进一步延续减少方向盘尺寸的趋势，目前标准的赛车方向盘直径只有普通道路车辆方向盘的一半大小。

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Results The acellular dermal matrix with normal colloid diameter and structure was made in this way, no cells in it.

结果：本方法制备的脱细胞真皮基质的胶原直径及排列结构均正常，无任何细胞成分。

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Drilling a 2 or 3 foot hole can be done with normal equipment, while drilling a ten, fifty, or one hundred foot diameter vertical hole would require an entirely new invention.

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