For equipment to monitor the working hours of the next

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51单片机的编程规范，对初学51编程有帮助。-51 microcontroller programming norms for beginners 51 programming help.

动态扫描键盘,键盘采用矩阵式结构,用KEILC51编译并运行过,可靠性好-Dynamic scanning keyboard, the keyboard matrix structure, using KEILC51 compiler and run-off, reliability, good

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