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Introduction: After Yi Liang was reborn, he gained a manufacturing upgrade system and started with an electric excavator toy. [Detecting that the host has completed the production of pure hand-made items, the system is officially opened, and the technological item 'PVC electric excavator toy' is obtained] [Item: PVC electric excavator toy] [Experience: 0\u002F1000] [Source point: 1] [Note (only): You can advance to an advanced level after reaching full experience. Source points are only used to redeem technological information for advanced items. In addition, in addition to obtaining source points by simply picking up items by hand, you can also obtain additional source points by popularizing common technology items. ... Let me go, the energy density of the first-order battery is 300wh\u002Fkg, all the technical information. ... Hiss, the second level jumps directly to 480wh\u002Fkg, all scientific and technical information. ...