随着孔径和喷嘴压降的增加，N值总是下降的。
N always decreases with the increase of nozzle pressure drop or orifice diameter.
在双喷嘴矩形喷动床内，以空气为喷动气体，研究了最大喷动压降与操作压降的变化规律和影响因素。
The maximum pressure drop and the operational pressure drop were investigated in a rectangular spouted bed with double nozzles by using air as spouting fluid.
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