我在三做的课程，当时拿到了９５分，包括完整的报告，有ＩＦ／else/read/for等语句的plo-I do three courses, then get 95 hours, including a full report, IF there / else / read / for such phrases as the plo

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步进电机为四相单四拍,8255输出步进电机驱动信号，电机线圈A、B、C、D四相由8255的PC口PC0-PC3控制，逆时针：D→DC→C→CB→B→BA→A→AD→D→…,顺时针：DA→A→AB→B→BC→C→CD→D→DA→… 键盘0~9控制转速，B或C控制方向，F退出 数码管显示S.SPEED- i，i为转速-Four-phase stepper motor is a single four-beat, 8255 stepper motor drive output signal,