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📁 科学

Food Science is the study of the production, transport, storage, processing, preparation and presentation of food, and this category is for sites giving an overview of the subject.

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📁 科学

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ORNL Energy Efficiency and Renewable Energy

http://www.ornl.gov/sci/eere/

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Tube Rebuilders

http://www.cpii.com/division.cfm/11

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DIY Vacuum Tube Testing

http://www.tubetesting.yolasite.com/

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Eimac's

http://www.cpii.com/library.cfm/9

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Frank's Electron Tube Pages

http://www.tubedata.org/

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Triode Electronics, Inc.

http://www.triodeelectronics.com/

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