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当前学科:己内酰胺装置操作工(高级)
题目:
多选
蒸馏回流时应注意的事项有:()。
A . A、检查回流管线是否畅通
B . B、关闭下成品泵槽阀门
C . C、关闭三个蒸馏塔蒸气阀
D . D、关闭残液下料阀
答案:
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