Pearl is an ancient organic gemstone produced in pearl shellfish and mother-of-pearl mollusks. The calcium carbonate-containing mineral (aragonite) beads produced by endocrine function are composed of a large number of tiny aragonite crystals. Into. Good pearls are precious and beautiful, and they are good collections and skin care products. So how do we maintain it? Let's share some knowledge about maintenance.
With its warmth, elegance, and magnificence, the pearl has always been loved by people and is known as the Queen of Jewelry. The composition of pearls is calcium carbonate containing mechanism. It has poor chemical stability, is soluble in acid and alkali, and is not suitable for contact with perfume, oil, salt, alcohol, hair cream, vinegar and dirt in daily life. Organic solvents; in summer, people sweat more, and should not wear pearl necklaces. When not in use, wash them with high-grade neutral soap or detergent, then dry them. Do not expose them to the sun or bake them in the sun; Put it together and don't put it in the bank's vault for a long time. The hardness of the pearl is low. Long-wearing white pearls will be yellowed, making the gloss worse. It can be bleached with 1%-1.5% hydrogen peroxide. Be careful not to drift over the head, otherwise it will lose its luster.
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4U Chassis is also called a 4u rack-mounted classis. The rack-mountable suits 19-inch rack, U is a unit that represents the height of the outside of the chassis, 4u is the height of the Server Chassis 4 times of 44.44MM. Its main role is to place and fix the motherboard, power supply, fan and other accessories to play a supporting and protective role.
4U Chassis
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