A.+5.4P，-1.8PB.+6.6P，-1.8PC.-6.6P，+1.8PD.-5.4P，+1.8P


A.+5.4P，-1.8P
B.+6.6P，-1.8P
C.-6.6P，+1.8P
D.-5.4P，+1.8P

参考解析

解析：根据结构力学知识计算。

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