问答题

中英互译：then I showed him a stack of cards for long－overdue books that I was beginning to think had actually been returned but were misshelved with the wrong cards in them.

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单项选择题

()是生产计划系统的核心。

A.主生产作业计划
B.物料需求计划
C.短期作业计划
D.能力计划

中英互译：平等互利是我们合作的基本原则。