What type of relationship is similar to a facet taxonomy in content management?什么类型的关系类似于内容管理中的分面分类?:()?
（A）Binary二进制
（B）Ternary三元
（C）Optional可选
（D）Parent-child亲子
（E）Recursive递归的 答案解析: -P452，书中提到复杂的多重层级面分类法(图一)，再看图二，同学们是否很像三元关系(图一)(图二)
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