单项选择题

图示水平梁CD的支承力与荷载均已知,其中F p =aq,M=a 2 q,支座A、B的约束力分别为:

A.F Az =0,F Ay =aq(↑),F By =3/2aq(↑)
B.F Az =0,F Ay =3/4aq(↑),F By =5/4aq(↑)
C.F Az =0,F Ay =1/2aq(↑),F By =5/2aq(↑)
D.F Az =0,F Ay =1/4aq(↑),F By =7/4aq(↑)
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