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Anno Domini - Wikipedia
A.D.: The Abbreviation Used in Dates for Anno Domini - ThoughtCo
模数A/D、数模D/A转换器知识 - 知乎 - 知乎专栏
A.D. - Oxford Learner's Dictionaries
模拟数字转换器 - 百度百科
What Is the Meaning of AD? Anno Domini: Year of Our Lord
Anno Domini, Before Christ: When Was That Calendar Invented? - TIME
A.D. - Common Errors in English Usage and More
English Alphabet | Learn English
Analog-to-digital converter - Wikipedia