【单选题】【消耗次数：1】
( )过程所发生的化学反应主要有：环烷烃脱氢芳构化、环烷烃异构化脱氢形成芳烃、烷烃脱氢芳构化和正构烷烃的异构化和加氢裂化等反应。
①
常减压蒸馏
②
催化裂化
③
催化重整
④
催化氧化
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相关题目
【单选题】
催化重整过程所发生的化学反应主要有：( )环烷烃异构脱氢形成芳烃、烷烃环化脱氢芳构化、正构烷烃的异构化和加氢裂化等反应。
①
环烷烃脱氢芳构化
②
叠合、反应缩合
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脂化
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烷基化
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away
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I see the Russian soldiers standing on the ________ of their native land, guarding the fields.
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threshold
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frontiers
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entrance
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gate
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In June 1941 Hitler suddenly launched an attack ______ Russia.
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for
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to
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for…of
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go out all@go all out
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make out all
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make all out
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to
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make all out
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go all out
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go out all
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launched
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developed
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for
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down
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on