题目：
各种各样的多段式炉在实质上都是三段式炉，都有（）段、加热段和均热段，不同之处是供热点数量和分布不同。
答案：
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各种各样的多段式炉在实质上都是三段式炉，都有（）段、加热段和均热段，不同之处是供热点
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