The control card identifies the source of the program, the category of all tapes, and the identification of library tapes when required.
控制卡识别程序的来源，所有磁带的种类，并且在需要的时候识别库磁带。
The control card identifies the source of the program, the category of all tapes, and the identification of library tapes when required.
控制卡识别程序的来源，所有磁带的种类，并且在需要的时候识别库磁带。
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