单选

以下关于XML文档遵守的规则描述中,错误的是(50)。

  • A.属性值必须加引号
  • B.元素名称无须区分大小写
  • C.元素可以嵌套,但不能交叉
  • D.文档中必须有且只有一个根元素
参考答案
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