排出炉外的烟气中含有可燃气体所造成的热损失称为（）损失。A、散热 B、排烟 C、完全

写出下列各句的问题。

1. My name is Dale.

______________________________ 

2. Tom is an American boy.    

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3. They are in the classroom.

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4. Her birthday is May 1st.    

______________________________

5. The sweaters are green.

______________________________

6. Their son is 9 years old.    

______________________________

7. It's seven dollars.

______________________________ 

8. It's an eraser in English.   

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— Will you please fly a kite with me in the park this afternoon?      

— _____. I will visit my grandparents in my hometown. [ ]

A. I think so

B. I'd like to

C. I'm afraid not

D. I'm afraid so

关于采油树上的小四通主要作用，（）说法是错误的。

A、连接生产闸门

B、连接回压闸门

C、连接测试闸门

D、连接总闸门

煤厚可分为总厚度与纯煤厚度。总厚度包括夹石层在内的全厚，也称煤层的全层厚；煤层的纯煤厚是指去掉夹矸厚度的纯煤层

简述反动式汽轮机工作原理？