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【单选题】
关于心脏杂音的叙述,下列哪项是错误的?A.
杂音在某瓣膜听诊区最响，提示病变在该区相应的瓣膜
B.
根据杂音最响部位及其传导方向，可判断杂音来源及其病理性质
C.
目前普遍采用的心脏各种杂音分级法为 Levine 6 级分级法
D.
不同时期出现的杂音，常反映不同的病变
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【简答题】中心静脉压的正常值为（）cmH 2 O。
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