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Each breeding house contains two rows of cattle beds, the total number of cattle beds is 20, 10 beds in a row. The area of a breeding house is 100m2. Between the two rows is a 1.8m-wide aisle. On both sides of the aisle are feeding troughs, the troughs are 60 cm wide and 25 cm deep, the outer edge is 70 cm high, the inner edge is 45 cm high. ................
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