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Chapter 115 - 114: Photos in the Old Album
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"Upgrade Option 1: Replace the circulating medium, improve the heat exchange efficiency of the equipment medium, survival points needed for upgrade: 300"
"Upgrade Option 2: Replace the circulating medium, enhance the circulating efficiency of the equipment medium, survival points needed for upgrade: 500"
The ground source heat pump equipment assembled by Chen Xin was still an ugly thing, but compared to the clutter of items created for the initial oxygen machine, this grou ...
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