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(2013·福建毕业班质量检查)—What does PM 2.5 mean?

—It's a professional ________ indicating the condition of air pollution.

Aterm Bitem Cnumber Dmark

 

A

【解析】A 句意:“PM 2.5是什么意思?”“它是一个表明空气污染状况的专业术语。”term在此表示术语

 

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