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.
A. 对
B. 错
The smallest units that affect meaning are morphemes.
A. 对
B. 错
Root refers to the base form of a word that can be further analyzed without loss of identity.
A. 对
B. 错
下列元素中,原子半径最小的是()
A. Na
B. Al
C. P
D. Cl