列管式换热器中最常见的三种类型为（）、（）和（）。
参考答案：固定管板式；浮头式；U型管式
Think and write. 用所给词的正确形式填空。
1. Our team (win) the game yesterday.
2. How many (minute) do you read books?
3. I eat cabbage____(one) a year.
4. Jenny____(go) to school every day.
5. I always____(eat) bread for breakfast.
白血病病人突然出现头痛、呕吐、视力模糊等症状，常提示可能发生了()。
A．败血症
B．脑膜炎
C．脑炎
D．颅内出血
E．消化道出血
