水套加热炉炉壁和烟管壁通过对流和辐射的方式向对流管传热。
参考答案：错
同义句变化。
1. It’s time for school now. It’s time _____ _____ to school now.
2. Whose yellow shirt is it? _____ _____ the yellow shirt?
3. I want anew ruler. I _____ _____ a new ruler.
4. Please give me your new book. Please give your new book _____ _____.
5. What time is it, please? _____ _____ _____, please?
（）采用突然剪断导、地线的做法松线。
A.可以
B.不宜
C.严禁
D.必须
