炉腹等部位采用（）冷却壁，它的作用是当该部位砖衬被侵蚀掉后，利于渣皮的形成。
参考答案：镶砖
Can you explain _____ most deserts are located near the west coast of the continents? [ ]
A. why is it that
B. why it is that
C. how it is that
D. how is it that
男性，18岁，与他人相撞致上前牙外伤。检查发现11位置低于咬合面，牙冠缩短，松动Ⅰ°，龈有少许撕裂，牙外伤的诊断是（）。
A.牙挫伤
B.牙脱位
C.冠折
D.根折
E.冠根折
