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【单选题】
一棵二叉树上第 5 层的结点数最多为( )。A.
15
B.
16
C.
32
D.
8
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反馈参考答案：
举一反三
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A.
for
B.
with
C.
to
D.
at
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A.
used to taking
B.
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is used to take
D.
was used to taking
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A.
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B.
The cost is different for adults and children.
C.
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