alleryWhat did a rotary winnowing fan use to produce an airstream?
AA leather bellows
BA turning water wheel
CA hand cranked fan
DA heated chimney
Answer & Solution
Correct answer: C. A hand cranked fan
1. Recall the idea: The rotary fan used a cranked fan to produce the airstream.
2. The correct choice is: A hand cranked fan.
3. The other options describe different methods or properties and do not fit this fact.
_Source: Wikipedia, Winnowing_
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