The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density.

The noise produced by a ______ cooled machine is less as the rotor mo

1.	The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density.
A.	air
B.	hydrogen
C.	either (A) or (B)
D.	none of the above
Answer» C. either (A) or (B)

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The noise produced by a ______ cooled machine is less as the rotor moves in a medium of smaller density.

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