How much vacuum is needed to obtain a clean surface of metal?
- A$10^{-8} \text{ to } 10^{-9} \text{ Pa}$
- B$10^{-1} \text{ to } 10^{-2} \text{ Pa}$
- C$10^{-5} \text{ to } 10^{-6} \text{ Pa}$
- D$10^{-10} \text{ to } 10^{-11} \text{ Pa}$
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