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    2021-3-26 · Vitamin D (also referred to as “calciferol”) is a fat-soluble vitamin that is naturally present in a few foods, added to others, and available as a dietary supplement. It is also produced endogenously when ultraviolet (UV) rays from sunlight strike the skin and trigger vitamin D synthesis.

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    2020-5-21 · D触发器是一个具有记忆功能的,具有两个稳定状态的信息存储器件,是构成多种时序电路的最基本逻辑单元,也是数字逻辑电路中一种重要的单元电路。 D触发器在时钟脉冲CP的前沿(正跳变01)发生翻转,触发器的次态取决于CP的脉冲上升沿到来之前D端的状态,即次态=D。

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