为何炉冷态启动初期汽包水位变送器的读数不可信？
参考答案：
因水位变送器平衡容器汽侧管路无凝结水使汽水侧水压差不能真实反映实际水位。
These old pictures __________ the unforgettable days _______ we spent on the farm.
A．reminded him; which
B．reminded him that; when
C．reminded him of; that
D．reminded him of; when
若设定8253芯片某通道为方式0后，其输出引脚OUT为什么电平？
