The plot development of the ppt novel "Red Covered Heads on Snowy Mountains" on the basis of the language of the secondary vocational school takes "Red Covered Heads" as the clue. It connects Su Wei and Xiao Xue's love story. The article can be divided into four parts: the first part (the first 1-3 Natural paragraph), the beginning of the story: writing Su Wei first saw Xiao Xue part two (paragraphs 4-10), story development: writing eight years later, encountering Xiao Xue, the two from knowing to falling in love part three (part 11——12 Nature Section), the climax of the story: writing Xiao Xue gave up his life in Beijing and resolutely went to Tibet to perform the fourth part (Sections 13-14) The ending of the story: writing Su Wei rushed to the Nora Pile Post and the statue in Xiao Xue Forward talk
A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask's surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection.
Vacuum flasks are used domestically to keep beverages hot or cold for extended periods of time and for many purposes in industry.
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