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【单选题】
决定巴比妥类药物作用时间长短的因素是( )。A.
5位取代基的水解
B.
5位取代基的氧化
C.
5位取代基的硝基化
D.
5位取代基的羟基化
E.
5位取代基的异构化
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举一反三
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【简答题】What is the Rangers’ role in taking care of the national parks?
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B.
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C.
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D.
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A.
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B.
Read some papers he recommended.
C.
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D.
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