心室充盈量的70%主要来自 （ ）A．中心静脉压升高B．心室舒张室内压降低的抽吸作用C．后负荷降低D．前负荷增加E．心房收缩挤入心室的
心室充盈量的70%主要来自 （ ）
A．中心静脉压升高
B．心室舒张室内压降低的抽吸作用
C．后负荷降低
D．前负荷增加
E．心房收缩挤入心室的
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