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Q: What are upstream and down stream valves?
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How did merchants benefit from the north and south winds along the Nile?

they could sail upstream and down stream


Is the O2 sensor for a 2000 Ford escort upstream or down stream?

both. upstream is under the hood, and the downstream is by the catalytic converter.


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Will another electrical outlet that is in line with a GFCI outlet cause it to kick off?

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