Must be able to choose the flow rate is less than the value of flow rate 13:4, 6, 8, 12, 4, 4 + 6 = 10 + 12 = 6 + 8 = 14, 16, 18, 6 + 12 = 8 + 4 + 12 = 20, 6 + 4 + 12 = 22, 8 + 6 + 12 = 24, 8 + 4 + 12 = 26, and 6 + 8 + 12 = 30 m3/min, automatic?
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