... od optical density difference 吸光度差 optical density (od) 光学密度 optical density card 光密度卡 ...
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A card on which binary coded data are recorded with recording density larger than a punched card. The recorded data can be readout by optical or magnetic readers.
一种二进制编码数据卡片，其记录密度大于穿孔卡片。所记录的数据可由光学或磁学读卡机读出。
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