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1.计算所有线段总长度(加载后只需框选所有线段便可得出这些线段的总长度)(defunc:ll()(setvar"cmdecho"1)(setqen(ssget(list'(0."spline,arc,line,elliPSe,lwpolyline"))))(setqi0)(setqll0)(repeat(sslengthen)(setqss(ssnameeni))(setqendata(entgetss))(command"lengthen"ss"")(setqdd(getvar"per....