具有结构紧凑、加热均匀、热量稳定、控制方便等优点的换热器是()。
A.热回收交换器
B.电加热器
C.盘管表面换热器
D.转轮式换热器
参考答案:B
In the Persian Gulf area, oil is found in ________ and its production has been able to keep up with world demand.[ ]
A. abundant
B. abundance
C. elegance
D. efficiency
Brodie脓肿即
A.局限性骨脓肿
B.Garre骨髓炎
C.创伤后骨髓炎
D.血源性骨髓炎
E.硬化性骨髓炎