在锅炉额定工况下，省煤器中产生的（）占（）的百分数称为省煤器的沸腾率。
参考答案：蒸汽量；额定蒸发量
3500与400的和是多少？差是多少？
– I argued with my best friend. ?
– Maybe you should say you’re sorry.
A. How was your feeling B. What would you do C. What should I do
