composite road train是什么意思

用法例句

Process on green corrosion inhibitors picking from natural propagation;

从天然动植物中提取绿色缓蚀剂的研究进展

Study on the refining technology of natural caffeine;

天然咖啡因精制工艺研究

The Activity and Their Mark of Nature and Synthetic Vitamin;

天然维生素和合成维生素的活性与标识

To explore brightening effect of nature product.

筛选具有增白作用的天然产物 ,为美白化妆品的开发提供了依据。

The article analyzes the affecting factors of nature moisture content by taking project as an example.

通过工程实例的体会,对天然含水量指标的影响因素进行了理论分析。