【单选题】【消耗次数：1】
图示结构用力矩分配法计算时，结点B的不平衡力矩(约束力矩，以对结点逆时针转为正)为( )。<img src=https://huaweicloudobs.ahjxjy.cn/1CC064A29C276DD792D4509A777030A0.png title=3.png alt=3.png/>
①
7pl/8
②
-7pl/8
③
9pl/8
④
-9pl/8
参考答案：
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