论文部分内容阅读
艾滋病病毒的起源
【出 处】
：
科学（中文版）
【发表日期】
：
1989年2期
其他文献
中铁四局在石济客专黄河公铁两用桥施工中，成功应用了变形和应力实时监控技术，通过监测支架变形数据采集和应力信息化控制，实现首跨54m公路箱梁高位浇筑施工动态全过程监控，这在
Background: In Bolivia there are few probiotic preparations available in the market, practically without alternatives to the use of freeze-dried products. An al
我国桥梁在飞速发展的过程中,由于其运营时间的增长及交通量与日俱增等原因,各种各样的病害也相继出现,本文针对当前常被忽视的水下桥墩加固技术进行研究,在总结相应加固技术研究现状的基础上,提出了预制混凝土管片快速拼装加固水下桥墩技术,详细介绍了其加固概念、优势、施工工艺流程及质量控制措施等内容,并在江西九江某大桥水下桥墩加固中成功进行了试点应用.相关研究结果表明:该加固技术不但可以提高结构的承载能力、变
Unstable intertrochanteric fracture in elderly is a challenging surgical condition with a high risk of morbidity and mortality. The aim of this study is to eval
耐酸瓷板在防腐蚀工程中存在质脆易碎、不适合有外力冲击和热应力冲击环境等问题.通过分析以环氧胶泥作结合层在大温差变化环境中破坏的原因,从理论上做出了解释;同时提出耐
The Outcome of Infants and Children with Heart Muscle Disease: Prognosis in Centers without Heart Tr
Objective: Acute heart failure due to heart muscle disease is potentially fatal in pediatric patients. Heart transplantation (Tx) is utilized to improve surviva
Intra-articular disorders of the hip in the elite athlete are common and potentially career threatening. Hip arthroscopy has been shown to be a safe and success