均匀分布竖向荷载作用下，三铰拱的合理拱轴线为（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='7343' and id < 574726 and id<>'574726' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='7343' and id > 574726 and id<>'574726' order by id asc limit 5