单项选择题

通常复合晶体管是由不同类型的晶体管组成，T1为小功率管，T2为大功率管。复合管的类型取决于()。

A.T1管
B.T2管
C.T1和T2管
D.以上说法都不对

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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.

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