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预制剪力墙外墙板采用夹心墙板时,外叶墙板厚度不应小于( )
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Morphology studies the internal structure of words and the rules by which words are formed.
Words are the smallest meaningful units of language.
Just as a phoneme is the basic unit in the study of phonology, so is a morpheme the basic unit in the study of morphology.
The smallest meaningful units that can be used freely all by themselves are free morphemes.
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