喷嘴内腔孔径应和喷嘴出口口径有一定的匹配关系。
Internal diameter nozzle and nozzle exit diameter should to be a certain degree of matching relations.
色谱柱在工厂填装时，出口端的筛板孔径必须比色谱柱中最小颗粒的粒径还要小。
When the column is packed at the factory, the porosity of frit at the outlet of the column must be lower than the smallest particle size of the column.
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