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【单选题】
若一棵完全二叉树有 768 个结点,则该二叉树中点的个数是( )。
A.
257
B.
258
C.
383
D.
384
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A.
正确
B.
错误
【单选题】Cohen 等在 ( ) 年构建了第一个有功能的重组 DNA 分子。
A.
1970
B.
1971
C.
1972
D.
1973
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A.
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B.
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C.
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D.
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E.
General Catalog of Herbs
【单选题】What is the oldest book on Chinese herbal medicine?
A.
Shennong's Materia Medica
B.
Huang Di Nei Jing
C.
Treatise on Fevers
D.
Compendium of Materia Medica
【单选题】维生素C缺乏时,伤口难以愈合的主要原因是:
A.
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B.
影响羟化酶使前胶原分子难以形成
C.
成纤维细胞增生低下
D.
影响羟化酶使胶原纤维不能交联
E.
影响氧化酶使胶原纤维不能交联
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