题目内容：
改造前后异丙苯的产量均为265000t/a，根据表1投入的原料量计算改扩建前后的总收率。
参考答案：
答案解析：
简答题：改造前后异丙苯的产量均为265000t/a，根据表1投入的原料量计算改扩建前后的总收率。
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