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【单选题】
下列关于维生素B12结构中钴原子的叙述错误的是（）。
A.
位啉环中心
B.
与环上的氮原子以一个共价键和三个配位键相结合
C.
与一个酮基相结合
D.
与苯并咪唑环上的N 3 相连接
E.
其正电荷与磷酸根的负电荷相互中和
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【多选题】给水管道水压试验前,应按要求回填()0.5m以内土方,管口处暂不回填,以便检查和修理。
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【单选题】Florida International University has opened what it says is the first computer art museum in the United States. You don't have to visit the University to see the art. You just need a computer linked t...
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A.
Many artists lost faith in the value of art.
B.
Many artists moved away from large cities.
C.
Many artists were forced to take jobs in other fields.
D.
Many artists in the United States moved to other countries.
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【简答题】Suppose the United States adopted central planning for its economy, and you became the chief planner. Among the millions of decisions that you need to make for next year are how many compact discs to ...
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A.
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