围绕薄煤层综采自动化采煤工艺技术的研发与应用展开论述,阐述了自动化开采技术现状及存在的问题,重点分析了支撑技术、电控自动化......

束裤是现代女性非常喜爱的塑身内衣产品之一，其着装压迫的安全性和舒适性也越来越多地受到消费者的重视着眼于调查臀部、腰腹部受压......

Background: To date, there is scant knowledge and inconsistent results about physical activity, exercise and job strain ......

Many studies have reported on the different types of placenta in different species, but accessory or paraplacental struc......