Everyone has their own duties. They need to obey their own rules. As a student, what should we do? In my opinion, we need to be polite at school. It’s common that students always say dirty words. It’
In biodiesel-fueled compression-ignition (CI) engines, dilution by unburned biodiesel has been found to have adverse effects on the boundary lubrication propert
To reduce the friction coefficient of cobalt-cemented tungsten carbide (WC–12Co) wear-resistant coatings, graphene was compounded into WC–12Co powder via wet