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【简答题】
在任何一棵二叉树中,度为0的结点 n 0 和度为2的结点 n 2 之间的关系是( )。
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反馈参考答案：
举一反三
【单选题】The passage mainly discusses ______.
A.
the differences in average income among countries
B.
the relationship between productivity and living standards
C.
the causes of the rise in living standards
D.
the importance of raising productivity
【判断题】The differences among languages are reflected in the differences in the worldviews of their speakers.
A.
正确
B.
错误
【多选题】There are great differences among ____________, ______________, _____________.
A.
different kinds of coal
B.
different parts of the different components of coal
C.
different coal seams of the same region
D.
different parts of the same kind of coal
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