Covid-19(Novel coronavirus pneumonia,NCP)was characterized by fever,dry cough,fatigue,greasy tongue coating and pulsatin......

Energizer原意为“激发器、情绪兴奋剂”。根据这个词的含义，我们可以将Energizer应用于英语教学中。合理恰当地运用Energizer，能充......

COVID-19 is caused by novel coronavirus(2019-nCoV),which has the characteristics of strong infectivity,rapid onset and r......

研究了在钢件上包裹膏状渗剂涂层和保护涂层进行渗铌的工艺方法.遴选了催渗剂和粘结剂,用X-射线衍射法分析了渗层的相组成,并对渗......