| 摘要 |
A pipe system connects a first supply tank to a flask for dissolving solids, connects the flask to a mixing tank, connects the first supply tank to the flask and to the mixing tank, connects a second supply tank to the mixing tank and connects the mixing tank to an outlet. Valves in the pipe system selectively control the connection of the first supply tank to the flask and to the mixing tank and of the mixing tank to the flask and to the first supply tank. Pumps in the pipe system pump liquids through the pipe system.
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