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定时/计数器1中断，由（ ）口线引入。
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51单片机中断源的自然优先顺序为（ ）、（）、（）、（）、（）。
单片机内外中断源按优先级别分为高级和低级，级别的高低是由 ()寄存器的置位状态决定的。
Identity refers to the ________ that make sb. or sth. what they are.
According to J. A. Hoffman, the four distinct aspects of late adolescents’ psychological separation from their parents are ________, ________, ________ and freedom from excessive need for approval, closeness, togetherness, and emotional support in relation to the mother and father.
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