The method of dynamic comparable tree classification was introduced to study the population structure of natural Japanese red pine forest in Northeast China.

本文采用动态可比性林木分级法，研究了东北东部天然赤松林的种群结构。

youdao

The fine structure of natural alkali feldspar selected from the basalt in the Hannuoba district, China was investigated by means of high resolution electron microscopy(HREM).

利用高分辨电子显微镜观察了产于河北汉诺坝玄武岩中碱性长石的精细结构。

youdao

With the continuous adjustment of energy structure in China, natural gas as a clean energy in China's share of energy consumption is growing up.

随着我国能源结构的不断调整，天然气作为清洁能源在我国能源消耗中的比重日益加大。

youdao