集重货物是指重量大于所装车辆负重面长度的最大容许载重量的货物。

Goods of concentrated weight shall mean the goods whose weight is heavier than the maximum weight allowed by the weight-bearing area length of the vehicle.

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以车削正四棱柱为例，进行了误差分析，得到了刀具长度与工件尺寸和容许误差间的关系。

Then by taking the regular square prism as an example, the machining error is analyzed, and the relationship among the length of the lathe tool, the work dimension and the tolerance is obtained.

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