Petroleum products - Determination of aromatic hydrocarbon types in middle distillates - High performance liquid chromatography method with refractive index detection.

石油产品。中间馏分产品中芳香烃类的测定。用折射指数检测的高性能液相色谱法。

youdao

Single age variable stock volume growth model had low coefficient of determination, but it was improved a lot by introducing site index and stand density index in reparameterization.

林龄单因变量的蓄积量生长模型决定系数低，引入地位指数和密度指数再次参数化的生长模型可显著提高模型拟合度。

youdao

Some practical problems of this technology, such as tool material selection, special optimization index of cutting parameters and tool geometry determination, are discussed as well.

本文还深入讨论了刀具材料、特定的切削用量优化指标以及刀具几何参数确定等实际技术问题。

youdao