Recognition with wire short circuit

The two copper core power cords are directly connected to the old battery electrodes to be determined, and then pour normally configured electrolyte (concentrated brine) into a glass cup, insert the two ends of the power cord into the tea cup, and The respective shelves are put on both sides of the glass (two wires can’t touch in the cup), then observe the bubbling of the respective leads in the electrolyte, if a certain wire bubble is obvious and more Multiple. Then explain that one end of the power cord connection battery is a negative electrode, and there is a small bubble and the end of the battery is the positive electrode of the battery.

Decide 

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