【判断题】
第439题：脱丁烷塔塔釜液位过高或过低，都会造成再沸器容易结焦而使运行周期缩短
A. 对
B. 错
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答案
A
解析
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【判断题】
第449题：受突发事件影响地区的生产经营单位应当根据本地区遭受损失的情况，制定救助、补偿、抚慰、抚恤、安置等善后工作计划并组织实施，妥善解决因处置突发事件引发的矛盾和纠纷
A. 对
B. 错
【判断题】
第478题：裂解炉从运行到烧焦及从烧焦到运行的阀门切换一定要小心。裂解气大阀的上游必须保持高于总管压力至少20-30KPa以防止裂解气倒流，最大不能超过350KPa以防止系统超压
A. 对
B. 错
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