use of chemical instruments and precautions: l. an instrument that can be heated   (l) a container used in a small amount of drugs, at room temperature or in a heating condition, for a small amount of reagent reaction, which can be used to make or collect a small amount of gas.  &ems...

  epoxy resin board:   1. the most common method is to clean the countertop with 70% concentrations of ethanol before and after work.   2. if it is only to remove the surface of the dirt, with a damp cloth can be used; if these dirty things are harder to wipe, it is recommended to ...

  teaching instrument is the material base of experiment teaching, and it is the important guarantee to improve the quality of experiment teaching. in recent years, because of the change of educational concept, the school has a new comprehensive understanding of the status and function of experimenta...