Appropriate methods are very important when there is a breakpoint within a boundary in a coordinate interval.
当边界在某一坐标区间内存在跃变点时，如何适当处理问题是值得注意的。
Second, it can be obtained the relationship between the boundary currents and the power line current by GDSEM in each line interval.
在每个区间内应用广义双侧消去法得到线路电流和边界电流之间的关系；
Secondly, the shock solutions as the shock layer near the boundary and interior of the interval are studied.
其次，研究了当激波在区间的边界附近和内部的激波解。
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