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天津贝壳堤
释义
天津贝壳堤
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理学
〔自然保护区〕
释
Tianjin shell dike
天津贝壳堤
在中国天津沿海古海岸上,由贝壳及其碎屑混以沙粒组合而成的堤状堆积物。
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powder diffractometer
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powdered activated carbon treatment process
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powder jet deep mixing reinforcement machine
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powder metallurgy alloys for electrical applications
powder metallurgy alloy steels
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