单项选择题
A.2l3/3EI B.5l3/3EI C.l/3EI D.4l3/3EI
A.μAB=1/2,μAD=1/6 B.μAB=4/11,μAD=1/8 C.μAB=1/2,μAD=1/8 D.μAB=4/11,μAD=1/6