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secondary source data
第二手资料
source data automation
原始数据自动化
缩为 SDA
(指以机械可读形式收集原始数据,一般的媒体有磁带 (magnetic tape)、打卡片 (punched card)、穿孔带 (punched tape))
source of data
资料
数据
来源
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