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==Science and technology== * [[Absolute Category Rating]], a subjective quality test method * [[Acumulador de Carga Rápida]], a battery electric tram system * [[Adobe Camera Raw]], a raw image file converter * [[Advanced CANDU reactor]], a nuclear reactor * [[Advanced Communications Riser]], a PC slot format * Advanced Contrast Ratio or [[Contrast ratio#Dynamic contrast (DC)|Dynamic Contrast]] in an LCD display * [[Anonymous call rejection]], a voice telephone network calling feature * [[Antarctic Cold Reversal]], climatic cooling about 14,500 years ago * [[List_of_screw_drives#Phillips_II|Anti Cam-Out Recess]], an improved Philips screwdriver * [[Attenuation-to-crosstalk ratio]] of communication links * [[Automatic content recognition]] of video * [[Copper tubing#United States, Canada and India|Copper tubing]] for air conditioning and refrigeration
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