A.QBA=-3iθA/l B.QBA=-6iθA/l C.QBA=-12iθA/l D.QBA=0
A.r11=r22 B.r12=r21 C.r12×Z2=r21×Z1 D.R1P=R2P
A.MB=2iθA B.MA=4iθA C.QAB=-3iθA/l D.QBA=-6iθA/l