2, heating method: suitable for powder pesticides. Take 5-10 grams of pesticides and heat them on a metal sheet. If a large amount of white smoke is produced, and there is a strong pungent smell, it means that the medicine is good, otherwise it indicates that it has failed.
3. Floating method: Suitable for wettable powder pesticides. First take 200 grams of water in a container, then take 1 gram of pesticide, gently spread evenly on the water surface, carefully observed, wet and soluble in water within 1 minute is an un-attenuated pesticide, otherwise it is a pesticide.
4, suspension method: suitable for wettable powder pesticides. Take 30-50 grams of pesticides, put them in a glass container, first add a small amount of water to make a paste, then add 150-200 grams of water and mix well. Observe for 10 minutes. The pesticides that have not expired are soluble, and the powder of the liquid is good. Small, slow sedimentation rate and low sedimentation.
5, dissolution method: suitable for suspension pesticides. Put the pesticide with the precipitate into the warm water (temperature 50-60 ° C), observe it after one hour, if the sediment slowly dissolves, it means that the medicament has not expired, otherwise it means it has failed.
Bookbinding is the process of connecting individual pages of a book into a single volume.
The history of bookbinding started in the first century with religious codices that were printed on vellum and bound.
This technique was the beginning of bookbinding and the same concept is still used today.
Hot-melt adhesives have advanced so much that the term [perfect binding" is now used to describe all adhesive binding
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