In sand blasting, the atmospheric pressure is about __________
A. 25-100atm B. 50-100atm C. 70-100atm D. 100-250atm
A. 25-100atm B. 50-100atm C. 70-100atm D. 100-250atm
A. True B. False
A. Corrode the metal B. Prevent from corrosion C. Increase the corrosion D. Slightly increase the corrosion