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光的特性

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产生激光的必要条件

谈谈激光在农业的应用

（）are effective note-taking skills.

A. Paraphrasing.
B. Using symbols.
C. Writing every word we hear.
D. Using Abbreviations.

What kind of symbols can be used in our note-taking? ( )

Arrows symbols and line symbols.
B. Mathematical symbols.
Chemical symbols.
D. Punctuation marks.