【单选题】【消耗次数：1】
紫外光区的波长范围为
①
760nm～2500nm
②
2.5μm～25μm
③
200nm～760nm
④
400nm～760nm
⑤
200nm～400nm
参考答案：
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设一棵m叉树中度数为0的结点数为N0，度数为1的结点数为Nl，……，度数为m的结点数为Nm，则N0=（）。
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