Two sounds are in free variation when they occur in the same environment and do not contrast, namely, the substitution of one for the other does not produce a different word, but merely a different pronunciation.

A.

【参考答案】

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自由变体是指两个音素出现在一个相同的语音环境中，并不区别意义，即用一个音素替换另一个音素不产生新词，只产生同......

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