1. The burning method is used for powder medicine. Take a proper amount of powder medicine and put it on the metal. Burn it on the fire. If it smokes, it means that it has not failed.
2. The oscillating method is used in emulsion medicines. Because emulsion pesticides are easy to stratify, according to this feature, first look at whether it is stratified. If it is not stratified, it means effective; if it is stratified, it can be oscillated several times to make it uniform and then allowed to stand for 40-60 minutes, then observe If it is not layered, it means there is no failure. If it is layered again, it cannot be used.
3. Dissolution method is used for precipitation of emulsion pesticides. 1 Put the vial into the water at 40-60 °C for about 60 minutes. If the sediment at the bottom of the bottle dissolves, it means that it has not failed. 2 The precipitate can be filtered out, take a certain amount and add appropriate amount of warm water, such as the precipitate dissolves. Still available.
4. For water, it is used in powders, wettable powders and emulsions. 1 powder can take 50 grams of medicine into a glass cup and add a certain amount of water, stir it to dissolve it, let it stand for 30 minutes, if the particles are suspended evenly and there is no sediment at the bottom of the bottle, it means that the drug has not failed. 2 The wettable powder is easy to agglomerate when stored, and the agglomerate can be first ground into powder, and a small amount of clear water is dissolved quickly. It is effective, but it can not be used again. 3 The emulsion can be put into the glass cup in a small amount, add the same water, stir and let stand for 30 minutes. If there is no oil on the water surface and there is no sediment on the bottom of the cup, it means that the emulsion is effective.
1. Features of tape measure
Gift rulers are used for advertising and promotion. They are divided into Steel tape (steel tape) and leather tape (PVC plastic fiber tape). They are usually cute and compact. Tape measures are also called measuring tools. Eighty-five percent of the world's tape measures are exported from China.
2, the characteristics of the tape measure
(1) The tape measure is too deformed and will not fail
Why didn't it fail? The spring in the tape measure is very long, and its range from completely relaxed to fully tightened is very large. The entire stroke of the tape measure includes it, and there is a margin at both ends, so the tape measure will not fail.
(2) Pull one meter long and pull two meters long, there is no difference in tension
The spring of the tape measure is very thin, and the amount of deformation when it is tightened is also small, so the reaction force is very small, and the force change is not felt when the rule is pulled.
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Yucheng tengxu Measuring Tool Co., Ltd , http://www.hardwaretoolstapemeasure.com