稳定工况
参考答案：
水电站机组在稳定运行情况下，机组的出力与电力系统负荷保持平衡，称为稳定工况。
_________the freezing wind ,they_________ the injured man in time. They felt sorry for that.
A．Had not been for ;could reach
B．If there was not; might have reached
C．But for; might reach
D．If there hadn’t been ; could have reached
上层建筑
