分析了多来多排的机理后认为：临界流速的非单值性是挟沙能力多值性的深层原因；

It deems after analyzing the mechanism of desilting as much as coming that non-uniqueness of critical velocity is the deep reason of multi-value of sediment carrying capacity and;

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单歧义源歧义格式，可以依据优先性原则确定一个歧义源，然后确定P值。

The single ambiguous form can confirm an ambiguous source according to the priority principle, and then confirm P value.

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首先根据特征值判据，给出单乘性区间线性系统鲁棒稳定性的充分必要条件。

Firstly, according to eigenvalue criterion, the robust stability necessary and sufficient conditions of single-multiplication interval linear systems are given.

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