D-value

The R& D investment projects have been proposed for several years. Now, the project value assessment method include: Discounted cash flow method 、 Decision tree 、 Obtain from the right camera analysis 、 and real options.

R&D投资项目价值的研究已经被广泛提出，目前的价值评估方法主要有：贴现现金流方法、决策树方法、相机索取权分析法、和实物期权分析方法。

Choosing to use D-B mode and selecting out the best-value contractor, it can improve the owner's investment benefit greatly.

选择应用D-B承发包模式，评出最有价值的承包商，可以大大提高业主的投资效益。

The value of D at the seedling stage and florescences were cluster analysed, the similar rate of results is 68%, indicating that the drought resistance of cotton are different mechanism at the seedling stage and the florescence. 3.

通过苗期和花期的D值对32品种聚类分析，结果相似率为68%，说明棉花苗期和花期在抗旱机制上有较大的差异。