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Crackles (rales) are caused by _________. Select one: A. narrowing of the upper airways B. air passing through fluid C. mucus in the larger airways D. severe bronchoconstriction

Crackles (rales) are caused by _________.
Select one:
A. narrowing of the upper airways
B. air passing through fluid
C. mucus in the larger airways
D. severe bronchoconstriction

 
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