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随便看	general national vocational qualificationsgnvq general national wealth General Natural Chart general nature general naval vessel General Navier-Stokes equation general navigation general navigation computer General Navigation Staff general NC language processor general need General Negation and Special Negation general-negation sentence general negative recorded announcement general negligence general neighbor-distinguishing chromatic index general neighbor-distinguishing edge coloring general neighborhood relation generalness general net theory general network general network management general network of telecommunication cha general network of telecommunication channel General Network Service System