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【单选题】
，男，48岁。有扩张型心肌病病史，主诉气急、乏力、出汗较多入院。身体评估：口唇发绀，两侧肺底部可湿性啰音。该病人出现乏力的主要原因是( )A.
肺循环淤血
B.
体循环淤血
C.
心排血量减少
D.
容量负荷过重
E.
压力负荷过重
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