(4)画弯矩图(kN·m) (5分) 3/7 4/7 0.4 0.6 A 0 C D -30 30 -200 200 0 0 40 -80 -120 0 45 90 120 60 -12 -24 -36 0 2.6 5.2 6.8 3.4 0.68 -1.36 -2.04 0 0.3 0.38 -17.6 125.5125.5 158.04 -158.04 0 1255(4) 图(kN· m) (5 317 417 0.4 0.6 A B C -30 30 -200 200 O O -40 -80 -120 O 45 90 120 60 -12 嘎争- -24 -36 2.6 5.2 6.8 3.4 -0.68 -1 .36 -2.04 O 0.3 0.38 -17.6 125.5 125.5 158.04 -158.04 1255