chief constitutents

On Non-party Personage s Main Historical Contribution;

论无党派人士的主要历史贡献

And it pays more attention to the cause systems of the main air pollutant and the harmness to the human health.

通过闻名世界的大气污染公害事件 ,说明大气对人类的重要性 ,并着重阐述主要大气污染物的发生机制及对人体健康的危

Major Process and Development Tendency for Urban Wastewater Treatment of Our Country;

我国城市污水处理的主要工艺及发展趋势

Analysis of key odorant compounds in brandy by sensory evaluation;

白兰地主要香气物质感官分析