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20、矩阵键盘（数码显示）\lesson4_3
........................\lesson4_3.asm
........................\lesson4_3.hex
........................\lesson4_3.lnp
........................\lesson4_3.LST
........................\lesson4_3.M51
........................\lesson4_3.OBJ
........................\lesson4_3.plg
........................\lesson4_3.uvopt
........................\lesson4_3.uvproj
........................\lesson4_3_uvopt.bak
........................\lesson4_3_uvproj.bak
20、矩阵键盘（数码显示）
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