在图中所示的自动控制电路中,当控制电路的开关S闭合时,工作电路的情况是
A.灯亮,电铃响
B.灯亮,电铃不响
C.灯不亮,电铃不响
D.灯不亮,电铃响
答案:D
正常调节每搏输出量多少的决定因素是()
A.心肌收缩力
B.静脉回心血量
C.动脉血压
D.静脉血压
E.心率
_____ our money, but we were nearly killed. [ ]
A. Not only we lost
B. Not only did We lose
C. We not only had lost
D. Not only we had lost