... Differential income 差额收益 Differential increment 增加差量 Differential profit ratio 差额利益比率 ...
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differential increment analysis 微元分析法
Equal differential increment rate principle 等微增率原则
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In accordance with flow characteristics of the catch-water channel, linear increment flow differential equation has been obtained by momentum law, and a numerical method has been made.
本文针对输水廊道的水流特点，应用动量定理建立起输水廊道沿程增量流微分方程，并给出一种数值解法。
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