一般我们的书上是这么说的:
有教材若干本,其中A类几本,B类几本。。。, 要放在K层书架上,每层不空,有几种方法?
:):)
一般我们的书上是这么说的:
有教材若干本,其中A类几本,B类几本。。。, 要放在K层书架上,每层不空,有几种方法?
:):)
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