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【多选题】
有关回流比的讲法中正确的是 _______ 。
A.
回流比通常用塔顶回流量 L 与塔顶产品量 D 之比表示
B.
增大回流比的措施是增大塔底的加热速率和塔顶的冷凝量，其代价是能耗的增大
C.
回流比可以在零（无回流）至无穷大（全回流）之间变化
D.
全回流时为达到指定的分离程度所需的理论 板 最少
E.
最小回流比对应于无穷多塔板数，设备费用无疑过大而不经济
F.
一般而言，操作过程所选的适宜回流比为最小回流比的 1.2 倍 ~2 倍
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