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【单选题】
目前,工业上乙烯的主要来源是
A.
石油裂解
B.
煤的干馏
C.
乙炔加氢
D.
乙醇脱水
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举一反三
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【单选题】设备间应采用外开双扇防火门。房门净高不应小于( )m,净宽不应小于( )m。
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B.
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【单选题】濒死病人最后消失的感觉是
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【单选题】濒死病人最后消失的感觉是
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B.
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【简答题】Most people know that Marie Curie was the first woman to win the Nobel Prize, and the first person to win it twice．However, few people know that she was also the mother of a Nobel Prize winner． Born i...
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【单选题】For a long time they walked without saying ___word . Jim was the first t break _____silence.
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【单选题】濒死期病人最后消失的感觉是
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【单选题】濒死病人最后消失的感觉是
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【单选题】For a long time they walked without saying ___word . Jim was the first t break _____silence.
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