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3 Rats like to follow the walls, so the medicine should be placed along the walls. According to the rat infestation situation, open the bag, every 15 square meters to put 2-3 points, each point put 5 pcs -10 pcs, observe the rat's feeding situation, a certain point is eaten by the rat how much, make up how much, if it is eaten up, then make up for the original double.