89C51/S51单片机有多少个外部中断( )(A)2个(B)4个(C)5个(D)8个

89C51/S51单片机有多少个外部中断( )(A)2个(B)4个(C)5个(D)8个

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8. When I was very young, I was terribly frightene

8. When I was very young, I was terribly frightened of school, but I soon ____ i

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89C51/S51单片机的串口接收中断标志是( )(A)TI(B)RI(C)EXIT0(D)EXIT

89C51/S51单片机的串口接收中断标志是( )(A)TI(B)RI(C)EXIT0(D)EXIT1

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