测距（数码管显示）
..................\STARTUP.A51
..................\STARTUP.LST
..................\STARTUP.OBJ
..................\测距
..................\测距.c
..................\测距.hex
..................\测距.lnp
..................\测距.LST
..................\测距.M51
..................\测距.OBJ
..................\测距.plg
..................\测距.uvopt
..................\测距.uvproj
..................\测距_uvopt.bak
..................\测距_uvproj.bak