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A light-emitting diode (LED) is a two-lead semiconductor light source. It is a p–n junction diode that emits light when activated. When a suitable voltage is ...
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Hallmarks, Touchmarks, and Guilds: Regulating the Production of Silver, Pewter, and Furniture. By John Fiske and Lisa Freeman. In early England, the selling and manufacturing of goods was tightly
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1. 设 U(t)! 0 是区间 [a,b] 上 的连续函数 , 在线性空间 C [a,b] 上定义二元函数: ( f , g ) (s) f (s)g (s)ds , f , g C [a , b] b a U ³ U 证明: (C [a,b], ( , ) U) 是 ...
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