【简答题】Nanoparticles that are naturally occurring (e.g. volcanic ash or soot from forest fires) or are the incidental byproducts of combustion processes (e.g. welding, diesel engines) are usually physically ...
【判断题】Nanoparticles that are naturally occurring (e.g. volcanic ash or soot from forest fires) or are the incidental byproducts of combustion processes (e.g. welding, diesel engines) are usually physically ...