1. Since the expansion coefficient of the sand core at the bottom of the glass sand core crucible is different from that of glass, the glass sand core is easy to absorb water when it is cleaned. Th...

1. Which industries are the main applications of the azotometer? Answer: The azotometer is an automatic instrument that can independently determine the nitrogen content according to the classical K...

Automatic fat analyzer (Soxhlet extractor) is based on the principle of Soxhlet extraction, which integrates hot soaking, extraction, leaching, solvent recovery and drying to extract and separate o...