the properties of the mixed residuum were carefully investigated with the aid of modern analytical apparatuswhen catalytical cracking decant oil was mixed with vacuum residuum
用现代分析仪器对催化裂化液油与真空渣油混合后的渣油的性质进行了细致的研究
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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