题目内容

What is the difference between a prescriptive and a descriptive approach to language？

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Point out three major differences between linguistics and traditional grammar.

波数

A. 200～400NM
C. 400～760NM
D. 760～2500NM
E. CM-1

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A. 200～400NM
C. 400～760NM
D. 760～2500NM
E. CM-1

formalism