2021-05-29 12:11 The unmodified coumarin dye is colorless flake or powdery crystal. It is barely insoluble in cold water, but can be dissolved in hot water.
2021-05-29 12:10 In addition to the properties of ordinary metals, metal gauzes also have some other advantages, such as filterability, large bearing capacity, and strong ability to adapt to deformation.
2021-05-29 12:10 Although their relative molecular mass is very large, they are all connected in a simple structural unit and repetitive way. The science of studying polymers is called polymer science.
2021-05-29 12:10 Although their relative molecular mass is very large, they are all connected in a simple structural unit and repetitive way. The science of studying polymers is called polymer science.
2021-05-29 12:10 Due to its rich variety and unique physical and chemical properties, metals are widely used in many fields such as organic chemistry, biomedicine and environmental protection.
