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  • 晶振的作用？

    晶振用一种能把电能和机械能相互转化的晶体在共振的状态下工作，以提供稳定，精确的单频振荡。在通常工作条件下，普通的晶振频率绝对精度可开发者_运维技巧达百万分之五十。高级的精度更高。有些晶振还可以由外加电压[详细]

    2023-02-17 15:06 分类：问答

  • How can you load a font (TTF) from a file using Core Text?

    Prior to OSX 10.6, ATSFontActivateFromFileSpecification/ATSFontActivateFromFileReference were available and could be used to l开发者_JS百科oad a font from a file.I can\'t find anything similar in Core[详细]

    2022-12-27 19:57 分类：问答

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