present value standard

This paper deals with the computer algorithm of sample average value and standard deviation based on the method of relarive frequency distribution analysis, which has a present importance for the prediction of fish and prawn farming.

用频率分组分析的方法研究了样本均值和标准差值的电算化算法，对鱼、虾情的预报有一定现实意义。

互联网摘选

NPV standard: If the net present value of project is more than zero, the project can be accepted; if the net present value is less than zero, it will be refused, and this project will not be considered in the future.

净现值法取舍标准是：如果项目净现值大于零，则立刻进行投资；如果净现值小于零，则拒绝投资该项目，并且以后也不再考虑投资该项目。

互联网摘选

Formerly the arc length error for the insulation resistance instrument is defined by scale arc length. At present national standard determines that the percentage of indicated value expresses it.

绝缘电阻表以前是按标度尺弧长定义的弧长误差，现行国家标准规定以指示值的百分数表示。

互联网摘选

At present the origin of the three criteria: the standard processing procedures, standards and change in tariff classification from the value-standards.

目前原产地的判断标准有三个：加工工序标准、税目归类改变标准和从价百分比标准。

互联网摘选