题目内容

（7）The contractive phase of the heartbeat is called _______.

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（8）A gas released as a metabolic product of catabolism is ______.

（9）Specialized conductive tissue at the base of the wall between the two upper heart chambers is the _______.

（10）An abnormal heart sound caused by improper closure of heart valves is a _____.

三相异步电动机的额定电压是指电动机正常工作时,定子绕组所加的()

A. 线电压
B. 相电压