题目：
在层次数据库中，父片段和子片段之间只能具有 【13】 类型的联系。
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
在层次数据库中，父片段和子片段之间只能具有 【13】 类型的联系。
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