本装置加热炉系统设有（）和（）两段换热面
参考答案：辐射段；对流段
Read and write．（读单词，并在横线上写出一个同类的词）
1. banana orange pear 2. six four twelve 3. sweater T-shirt skirt
4. singer worker nurse 5. white yellow green 6. dog fish bird
People from different places come to visit Zhaoqing ______ is famous for its beautiful mountains and lakes.
A. what B. which C. who
