本文从内部收益率基本原理出发，建立了一套适用于任何情况下使用内部收益率的决策准则。
A new set of decision rules which can be used for any situation is developed according to the basic principle of this method.
在使用内部收益率方法进行工程项目的论证和此较时，由于方法内在原因，可能发生不确定现象。
When assessing or comparing engineering projects with the method of internal profit rate, ambiguous answers might take place because of the internal reasons of the method.
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