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Updated: May 2, 2026

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测量空气污染的影响

Robert Mendelsohn1, Seung Min Kim2

  • 1Yale School of the Environment, New Haven, CT, USA.

Science (New York, N.Y.)
|November 23, 2023
PubMed
概括

减少煤炭发电厂造成的空气污染导致死亡率下降. 这项研究强调了清洁能源对公众健康的重大益处.

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Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...
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