锅炉炉墙结构形式可分为几种？
参考答案：
根据炉墙的承受方式及单位面积（或体积）重量的不同，炉墙的结构形式可分为三咱：重型炉墙，轻型炉墙和敷管式炉墙。
30．Danis is______hunting for a new job and has no eye for his wife and children.
A．occupied in
B．busy for
C．absorbed to
D．engaged to
I want to buy a book and three .
A. pen B. ruler C. scarves
