丰度

In the stream with strong bed load movement there is no benthic macroinvertebrate.

河势散乱且河床运动剧烈的支流种丰和密均很低甚至为零，态条件差。

Biological marks of the crude oil contain long lateral chain of tricyclic terpane, and the content of gammacerane is low.

原标志化合分布,见长侧链三环萜烷,但γ-蜡烷丰较低。

In the cool seasons, Navicula subminuscula, a eurythermal species, was the major dominant species, while warm water species increased rapidly with increasing air temperature.

不同季节浮游植丰差异小, 以硅藻门丰占优势, 但与冷季相比, 暖季中甲藻门和蓝藻门丰明。

Uranium isotope abundance ratio has been measured by total sample evaporation and signal integration,and a thermal surface ionization mass sepctrometry equipped with multicollector has been used.

采用全蒸发技术、离子流强积分的方式,用多接收器热表面电离质谱计测量铀同位素丰。