目前,中国农村中受过高等教育、有较强技能的人都流向了城市,留守农民劳动力素质不高,受教育的程度低,科技文化素质较差,观念落后,......

Summary:This study compared the clinical outcomes of the frozen-thawed cycles of high-quality cleavage embryos with low-......

Experimental study was conducted with regard to upgrading low-quality coal by low temperature pyrolysis technology and f......