bottleneck
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The control valve between the distillation tower and the condenser acts as a bottleneck for the gas phase, while the control valve between the condenser and the reflux tank functions as a bottleneck for the liquid phase. The control valve on the gas line from the distillation tower to the condenser, up to the reflux tank, serves as a thermal bypass
First-graders generally have low IQs; many of them don’t even know what they are supposed to do
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