高加水位保护的动作结果是什么？
参考答案：
抽汽电动门、逆止门关闭，三通阀动作给水走旁路，高加解列。
诊断主动脉瓣关闭不全最重要的体征是
A．周围血管征
B．主动脉瓣区叹气样舒张期杂音向心尖传导
C．主动脉瓣区第二心音减弱或消失
D．心尖抬举样搏动
E．主动脉瓣区吹风样杂音向颈部传导
The millions of calculations involved, had they been done by hand, () all practical value by the time they were finished.
A. had lost
B. would have lost
C. would lose
D. should have lost
