Are we informed about cheap robot vacuum cleaner weight and volume after shipment?
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Why is the sea salty, but the fish in the sea is not salty Hard bone fish in the ocean have a strong ability to discharge salt, and there are special organs for discharging Salt. these organs are long in the Gill slices of the fish and are composed of 'chlorine cells.'Chlorine-producing cells' can secrete chloride, such as a 'fresh water workshop' on fish, which can dilute the seawater entering the fish body, and fish with high efficiency do have a special function,Let them remain salty in the sea.Fish in seawater are generally divided into hard bone fish and cartilage fish,For hard bone fish,The 'Gill' on which they breathe is really a magical organ.Because while it delivers oxygen,It also played a function of desalination.The 'chlorine cells' in the Gill slices are like a filter,Absorb the water from the seawater that the hard bone fish drinks in,The salt is filtered out.The efficiency of this chlorine-producing cell is quite high,Any kind of desalination device that we humans make is not comparable to it.T
What is the internal material of the hard disk? How much alloy or plastic? Disk disk is the medium for carrying data storage in the hard disk,The hard disk is superimposed by multiple disks,Separated by washers from each other.The hard disk is based on solid and durable materials,It is attached to magnetic substances,The surface is processed fairly smoothly.Because the disk is rotating at high speed inside the hard disk (5400 rpm, 7200 rpm, 10000 rpm,Even 15000 turns ),Therefore, the material hardness and wear resistance of the plate are very high,Therefore, alloy materials are generally used,Mostly aluminum alloy.The hard disk is constantly improving with the development of the hard disk,Early hard disk discs used plastic materials as disk bases,Then apply the magnetic material to the plastic disk base to form the disk of the hard disk.Later, with the increase of the speed and capacity of the hard disk, the metal disk-based disk,The disk base of the metal material has higher recording density and stronge