A.4 B.5 C.6 D.7
A.分流點(diǎn) B.合流點(diǎn) C.沖突點(diǎn) D.危險(xiǎn)點(diǎn)
A.1:1000 B.1:5000 C.1:500~1:2000 D.1:5000~1:10000