By using binary tree instead of2-D table, the new method can avoid of traversing in whole table to find a matched code, and can speedup lookup pro cess2 ~ 3times.
通过将二维码表转换成二叉树形式，避免了对整个码表的遍历查找过程，使查找速度提高了2 ~ 3倍。
Note: 1. The laying method in correspondence with D category in the table 1-18(GB/T16895.15-2002), which is suitable for the direct cable burying or cable layout in the underground conduit.
注： 1。敷设方式对应于表1-18（GB/T16895.15-2002）中的D类，适用于电缆直接埋地或电缆敷设在地下的管道内。
Note: the ampacity provided here are only the ampacities of B1, D, E, F and G. The ampacities of other laying method can be calculated according to above table through conversion.
注：本样本编制的载流量仅仅是B1、D、E、F、G的载流量，其余敷设方式的载流量可以按上表换算求得。
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