目的:观察复方槐花补骨脂酊联合NB-UVB治疗稳定期散发型白癜风的疗效及安全性。方法:将190例稳定期散发型白癜风患者随机分为治疗......

试验0.5~0.7Cr铲斗刀板型钢（/%：0.22~0.30C,0.25~0.45Si,0.95~1.20Mn,0.006~0.009P,0.008~0.010S,0.5~0.7Cr,0.015~0.065Nb,0~0.040T......

The effects of yttrium and cerium on microstructures and properties of Nb-Si system composites were investigated by scan......

针对古建筑、码头、景区等地方的消防炮控制系统采用有线组网设计存在着安装布线复杂、后期维护困难等缺点,提出一种基于NB-IoT与......