Please transfer the knowledge points of Unit 1-12 of junior high school chemistry to me, OK? Thank you! Chemistry is a science that studies the composition, structure, nature and the law of change of matter.1. use drugs to achieve 'Three Noes': you can't directly contact drugs with your hands,Can not put the nostrils to the mouth of the container to smell the smell of the drug,Do not taste any medicine.2. pay attention to saving the use of drugs: the use of drugs should be strictly in accordance with the dosage specified in the laboratory,If the amount is not stated,Usually take the minimum amount,That is, take 1-liquid-2 mL,Solid just cover the bottom of the tube.3. The remaining medicines should be 't
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Which kind of water purifier is good? There is no absolute good or bad, it is necessary to choose a water purifier according to the water quality of each place:1: the hardness of the water quality in the North is high, the hardness of the water quality in the South is low, and the water quality is good.From this point of view, it will be better to choose RO reverse osmosis water purifier in the north, and ultra-filtration water purifier can be considered in the South.2. according to the type of water source: rural well water and municipal tap water.Generally speaking, most of the current water purifiers are not designed for the situation of rural well water. a model similar to CL-DR-B103ZX is more suitable for the filtration of well water:If the municipal tap water has scale after burning, you can consider using RO reverse osmosis type water purifier;3: according to their own needs.If you want to drink directly, then it is recommended to use RO reverse osmosis water purifier. if you open it for drinki
