题目内容

级组是指任意的若干蒸汽流量近似相等的串联级，若级组中各级在变动工况下始终处于亚临界状态，级组变工况前后质量之比等于级组前后压力平方差的开方之比，该方式称为()。

A. 流量比公式
B. 费留盖尔公式
C. 超临界工况流量比公式
D. 亚临界工况流量比公式

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Section B
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