除氧器壳体材料宜采用20g或20R，不应采用16Mn和Q235，对于匹配直流锅炉的除氧器，除氧头壳体材料宜采用复合钢板（）
参考答案：对
____ all kinds of knowledge ,he was admitted to a key university.
A．Equipped with
B．Having equipped for
C．Armed for
D．Having armed with
下列哪一种的手、足癣最易继发感染？（）
A.水疱鳞屑型手癣
B.角化过度型足癣
C.浸渍糜烂型足癣
D.浸渍糜烂型手癣
E.水疱鳞屑型足癣
