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[Daily Question #167] June 12, 2020

2020-06-12View Original

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This post was last edited by GreenLotus on 2020-6-13 at 21:16. [Daily Question #167] On June 12, 2020, the valve at the top of the inverted U-tube closes when the water level in the seal tank becomes too high. True or False questions () Please answer within two days.

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