Observation method: In a well-lit environment, see whether the glazed tiles have chromatic aberration, cracks, bubbles, pinholes, black spots, scratches, missing corners, etc., and whether the mirror effect is strong or not.
Listening method: tap the brick body by hand. If the sound is crisp, sweet, and has metallic sound quality, then the density of the brick is high, and the sintering is good for good quality. On the contrary, if the sound is husky, there may be cracks in the brick body. Low, for inferior products.
Test method: pour a little ink or tea on the brick for two minutes, then rinse with water or wipe with a cloth. If there is a trace of residue, the brick body has low water absorption, good anti-fouling performance, and good physical and chemical properties; if obvious Or serious traces, the degree of vitrification brick, poor quality.
Measurement method: Carefully use the ruler to measure the length of the four sides of the tile and the diagonal to see if it matches the size provided by the manufacturer. Sputum method: hand rubbing bricks, feel heavy, high density, high hardness; the contrary, the texture is poor.
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The cover glass is covered on the material on the glass slide, which can avoid the contact between the liquid and the objective lens, so as not to contaminate the lens, and can make the top of the observed cells in the same plane, that is, the distance from the objective lens is the same, so that the observed Images are clearer.Why do you need a coverslip when using a microscope
1. Make the object to be observed form a thin film, which is easy to transmit light and easy to observe;
2. Make the specimen relatively fixed;
3. It is convenient to use the capillary phenomenon to form a gradient when adding various reagents (staining agent, acid, salt solution);
4. Avoid contamination of the specimen.
The purpose of staining the specimen with iodine solution is to make the cells more obvious under the microscope, and it can also kill the cells and prevent the cells from migrating.
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