Mills start with a hard, strong construction grade wood like Douglas fir, and then preservative chemicals are injected under pressure to limit the effects of insect and rot damage.
Taking three-axle vehicle as an example, the calculation formula of parking gradelimit of multi-axle vehicle is derived with its influencing factors analyzed.
以三轴汽车为例，推导出多轴汽车的驻车极限坡度计算公式，并对其影响因素进行分析。
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In addition, a concept named utilization rate of gradelimit is proposed as a supplement to the analysis indicators of parking braking performance.