It is a flu-based nasal spray COVID-19 vaccine that could generate immunity against both flu and COVID-19.
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This is an unique method for the identification and quantification of the SARS-CoV-2 in sewage sample for the use in surveillance of seage for SARS-CoV-2.
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This newly invented ultra-strong steel is a new type of steel with ultra-high strength and good ductility with low price and easy manufacturing. It can be served as an alternative material in automotive and aerospace industries with high demand for lightweight and energy-efficient. It's ready fo.....
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一种供钻井眼的钻孔机组使用的装置。钻孔机组的冲击机构、顶推机构和旋转机构分别跟钻头连接，这些机构分别由第一、第二和第三种压力下的第一、第二和第三种流体驱动，分别将冲击力、推力和转矩传递给钻头。冲击力、推力和转矩分别随第一、第二和第三种压力改变。所述装置包括分别与第一、第二和第三种流体连通的第一、第二和第三压力传感器，分别输出随第一、第二和第三种压力而改变的第一、第二和第三电信号。位置传感器输出随相对于基准点的钻头深度而改变的第四电信号。仪器监测第一、第二、第三和第四信号并产生关于冲击力、推力、转矩和深度的相应的图表曲线。
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