测量工业车辆中一个轮轴的轮胎中心之间的距离。如果前后轮轴的长度不同，则必须区分前后轮胎的不同轮胎基础。
Measure of the distance between the tyre centres of one wheel axle in industrial trucks. Different tyre-bases in front and rear must be distinguished if length of front and rear axle is different.
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