A.125kN;62.5kNB.62.5kN;125kNC.125kN;250kND.250kN;125kNE.100kN;200kN
A.-3,+2B.-2,+2C.-3,+3D.-2,+3E.-3,+4
A.±2B.±3C.±10D.±20E.±30