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
······· 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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