【单选题】【消耗次数：1】
流经鲫鱼心脏的血液是：
①
动脉血
②
静脉血
③
动、静脉混合血
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病人平卧抬高下肢，排空静脉血，在大腿根部扎止血带阻断大隐静脉，然后让病人站立，10秒钟内放开止血带，若出现自上而下的静脉逆向充盈，提示
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