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AC, A.C. or Ac may refer to: * Air conditioning (often referred to as aircon, AC or A/C), the process of altering the properties of air (primarily temperature and humidity) to more favourable conditions * Alternating current, a type of electrical current where the current repeatedly changes direction * Air Canada, the flag carrier and largest airline of Canada by IATA code ==Computing== * AC (complexity), a hierarchy of complexity classes found in circuit complexity * Authorization certificate or attribute certificate, a digital permission to use a service or resource * .ac, Internet top-level domain name for Ascension Island * .ac (second-level domain), Internet second-level domain used to denote academic institutions in many countries 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AC」の詳細全文を読む スポンサード リンク
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