Question: HPLC (High Efficiency Liquid Chromatography) uses packings with a range of size or particle diameter typical of: 
 Options:  <1> 3-10 Armstrong. <2> 3-10 Nanometers. <3> 3-10 Millimeters. <4> 3-10 Micrometers. <5> 3-10 Centimeters
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