3、09);1.9thequalitycheckoutandevaluationofelectricequipmentinstallationengineeringcode(DL/T5161.1-2002~5161.17-2002);1.10thenormsofconstructionsupervision,theelectricpowerconstructionsupervisionregulations11、如图,直线a,b都与c相交,由下列条件能推出的是( ) ① ② ③ ④ A.① B.①② C.①②③ D.①②③