__For the production of very high vacuum, a __________ pump is normall

1.	__For the production of very high vacuum, a __________ pump is normally used.__
A.	Diffusion
B.	Centrifugal
C.	Jet ejector
D.	Piston
Answer» B. Centrifugal

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For the production of very high vacuum, a ______ pump is normally used.

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__For the production of very high vacuum, a __________ pump is normally used.__

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For the production of very high vacuum, a ______ pump is normally used.