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当前学科：丙烯腈装置操作工(高级)
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当进入急冷塔上段反应出口气体总量一定时，降低急冷塔上段pH值对改善急冷塔上段氨中和效果（）。
A . A、无影响
B . B、不利
C . C、有所不利
D . D、有利
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