选择题:以下叙述不对的是:二次曲面的解析表达方程中

题目内容:
以下叙述不对的是:二次曲面的解析表达方程中

A三个变量必须全都有二次形式
B三个变量必须全都没有二次形式
C三个变量必须全都有一次形式
D三个变量中至少有一个是二次形式
参考答案:

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