该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生......

为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......

The a-amino carbonyl functionality is not only a segment of biologically important natural products but also a versatile......

IntroductionCarbamates are important intermediates in the syntheses of pesticides, herbicides, drugs[1], polyurethane-ba......

Sulfamic acid has been proved to be the most efficient and recyclable catalyst in carbamate synthesis from alkylamine an......