CNC machining parts with high accuracy is mainly due to ( ). A: Multiple clamping single station machining B: Once clamping multi-station machining C: Multiple clamping and multi-station machining D: Small machine tool vibration

When carrying out vacuum filtration which of the following isNOT necessary A: Clamping the Buchner flask B: Breaking the seal before turning off the vacuum C: Folding the filter pape D: Wetting the filter paper before you start