介绍了增碳剂在铁液中溶解的机理和目前主要采用的投入法和喷粉法增碳工艺。
This paper presents the process of getting the qualified molten iron through melting scrap, carburant and moderate cast pig iron, which offers a new way for producing ductile iron.
然而在阻塞费用对阻塞线路的分摊中，目前提出的影子价格法和边际微增法仍存在一些不合理的地方。
Unfortunately in the congestion cost allocation to congested lines, the shadow price method and the marginal and incremental method existed have some defects.
用此公式得出微增率法可用之等价条件，讨论微增率法之缺点及其改进途径。
Using this formula, we obtain the equivalent conditions for the suitable use of the increamental method, discuss the drawback of the increamental method and the way to improve it.
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