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When there is liquid in the Pipette tip, do not place the pipette horizontally or upside down, so as to prevent the liquid from flowing back and corroding the piston spring.In the process of biological experiments, especially in the field of Cell Culture, the pipette is an indispensable laboratory instrument, and the pipette holder is also used very frequently on the laboratory ultra-clean bench or in the biological safety cabinet. The ease of use of the pipette and the pipette holder also affects the ease of experimental operation.
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According to experts, the “three more†method refers to the appearance of a high-viscosity coating with good brushing effect. The quality is better. The smell of the two smells. After the cans are opened, the paint smells like a can. The taste of the good paint is not very irritating and the taste is lighter after use. If the paint is irritating after opening, it is best not to use it. In addition to color and gloss, the intrinsic quality and environmental protection of the coating are the most important factors. Three than the brand, in general, joint ventures, imported brands of paint quality and environmental protection are more assured.
For individual businesses will be fake and shoddy paint brand-name packaging for sale behavior, experts suggest that consumers in the purchase of paint, it is best to buy the designated brand store to avoid the use of the process there is no way to complain. After entering the store, the first thing to look for is whether the store is really a special brand paint shop, if the store has a large number of agent brands, the reliability of its monopoly will have to consider a lot; Second, the regular brand agents have a series of Certification documents, before the sales staff introduces the product, it is best to verify their agency identities and look at the brand licensing documents; Third, the franchise store staff of well-known brands have been professionally trained, their product characteristics, uses, coating dosage The calculations and other related knowledge all have certain understanding and can answer many professional issues. Consumers can ask questions first and test them. If even simple paint knowledge is not available, the credibility of such stores will be greatly reduced.
Experts emphasized that when choosing paint, it is necessary to pay attention to the use of accessories in construction, especially plastics and primers. “Even if you choose green paint, you can't be sloppy when handling substrates. Well-known brands of primers can not only guarantee the overall effect, but also absolutely necessary from an environmental point of view. In addition, the use of plastics should also be noted that 107 gel contains harmful substances, The relevant regulations of the state have explicitly banned the use of home decoration. For these easily overlooked accessories, special attention must be paid." 
Home decoration purchase paint expert experts recommend "three more" method
Coatings are widely used in home decoration and play an important role in the aesthetic effect of decoration. Experts suggest that consumers can use the “more than three†method of seeing, hearing, and comparing when choosing coatings.