【单选题】【消耗次数:1】
心尖朝向( )。
右前下方
左前下方
右后上方
右后方
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【判断题】 心尖朝向左前下方、由左心室构成()
①  正确
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【单选题】 心尖朝向( )。
①  右前下方
②  左前下方
③  右后上方
④  右后方
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