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The audi sedan logo is four circles representing four companies before the merger. These companies used to be manufacturers of bicycles, motorcycles and buses. Since the company was originally a merger of four companies, each ring is a symbol of one of the companies.
Hydro turbines, the oldest and also the mostly used renewable energy source, hold the highest efficient of power conversion process. The potential head of water is available next to the turbine, so there aren't any energy conversion losses, exactly the mechanical and copper losses inside the turbine and generator and the tail end loss. The efficiency is inside the range of 85 to 90 %.
Sunglasses allow better vision in bright daylight, and may protect one's eyes against damage from high levels of ultraviolet light. Typical sunglasses are darkened for protection against bright light or glare; some specialized glasses are clear in dark or indoor conditions, but turn into sunglasses when in bright light. Most sunglasses do not have corrective power in the lenses; however, special prescription sunglasses can be ordered. Specialized glasses may be used for viewing specific visual information (such as stereoscopy) or 3D glasses for viewing three-dimensional movies. Sometimes glasses with no corrective power in the lenses are worn simply for aesthetic or fashion purposes. Even with glasses used for vision correction, a wide range of designs are available for fashion purposes, using plastic, wire, and other materials.
1, if the temperature is below 38.5 ℃, or associated with headache, nausea and other symptoms commonly, need not special treatment, or baby do physical cooling, generally after physical cooling, the baby's body temperature returned to normal, headache, nausea will disappear or ease.
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