题目内容
对B受力分析如图示,由平衡条件得 ······· 5分
对A由平衡条件得 ·················································· 5分
对A、B整体由平衡条件得 ······································· 5分
联立以上三式,求得 ··········································· 5分
对A由平衡条件得 ·················································· 5分
对A、B整体由平衡条件得 ······································· 5分
联立以上三式,求得 ··········································· 5分
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