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例程
....\lesson4zuoye.lst
....\lesson4zuoye.obj
....\lessson4_1
....\lessson4_1.LST
....\lessson4_1.M51
....\lessson4_1.OBJ
....\lessson4_1.Opt
....\lessson4_1.Uv2
....\lessson4_1.c
....\lessson4_1.hex
....\lessson4_1.lnp
....\lessson4_1.plg
....\lessson4_2.LST
....\lessson4_2.OBJ
....\lessson4_2.c
....\lessson4_3.LST
....\lessson4_3.OBJ
....\lessson4_3.c