To resolve the difficulty of progressive time calculating in normal inverse-time overcurrent curve, two algorithms of zonal table-lookup and Taylor expansion are put forward.

然后针对计算比较困难的一般反时限曲线，介绍了分区查表和泰勒展开法计算时延累加量的算法。

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But since the early 1990s education spending has become much more progressive, with a huge expansion in public secondary education among the poor.

ECONOMIST: An unequal continent is becoming less so