... , CD, shave palpus knife , comb , toothbrush , artificial tooth , tea set etc. And milk bottle ,milk chews or fruit ... the problems.5.Clock and watch , precision instrument: Have ultrasonic cleaner ,you shouldnt Dismount screw , gear wheel , hairspring ... various medical apparatus, as operation appliancethe ,dentistry artificial tooth , tooth model , the utensil of chemistry experiment laboratory,all ...