题目内容
The smalllest meaningful unit of language is allomorph.
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Affixes are generally classified into three subtypes, namely, prefix, suffix, and infix, depending on their position around the root or stem of a word.
The smallest units that affect meaning are morphemes.
Root refers to the base form of a word that can be further analyzed without loss of identity.
下列元素中，原子半径最小的是（）
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