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C-day

化学, 电子产品 date du changement de gaz; jour J; jour de la conversion
 英语 词库
C-DAY
缩写, 军队 Conversion Day; Day Deployment Operations Commence
C-day
美国 The unnamed day on which a deployment operation commences or is to commence (JP 5-0)
C-Day
缩写 Day in Which Movement From Origin Begins