A.file- ->set project to current file
B.node- ->enter node from SNF
C.assign- ->pin/location chip
D.file- ->create default symbol]
A.SIMATICSTEP7ProfessionalV15
B.SIMATICSTEP7PLCSIMV15
C.SIMATICWinCCProfessionalV15
D.SINAMICSStartdriveV15
Proteus软件是美国Labcenter electronics公司开发的EDA工具软件。( )