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【单选题】
心搏出量与心输出量有什么不同( )
A.
心搏出量在数值上与心输出量相同
B.
心率不变时，心搏出量增大反而使心输出量减低
C.
心输出量是心搏出量乘以心率，心输出量是每次心搏的排血量
D.
心搏出量大于心输出量
E.
心输出量不乘以心率，心搏出量需计算心率
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