多项选择题
关于双级布置的说法正确的是（ ）。 A.
与单级布置相比，热风温度可以加热到更高温度 B.
烟气依次经过第二级空气预热器、第二级省煤器、第一级空气预热器、第一级省煤器。 C.
烟气依次经过第二级省煤器、第二级空气预热器、第一级省煤器、第一级空气预热器。 D.
第一级空气预热器常采用回转式空气预热器
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