(1) Cov khoom loj loj, ntau qhov kev tso kawm ntawm feeders, thiab siab stability
(2) Substrate mechanical positioning + visual positioning Mark point, siab precision
(3) Kev hloov kab nrawm, ntau yam khoom siv sib xws
(4) Muaj zog versatility, ywj siab Feeder, yooj yim los hloov
(5) Tsis siv neeg pub khoom noj ntawm cov khoom hauv ntau, daim kab xev, raj thiab tais