A.200Ω B.25Ω C.100Ω D.12.5Ω
A.2:3,3:2 B.3:2,2:3 C.1:1,3:2 D.2:3,1:1
A.2.8N·m B.5.6N·m C.54~61N·m D.190~203N·m