alleryWhich country first developed the rotary winnowing fan?
AGreece
BScotland
CSweden
DChina
Answer & Solution
Correct answer: D. China
1. Recall the idea: Ancient China improved winnowing with a rotary fan that used a cranked fan to make the airstream.
2. The correct choice is: China.
3. The other options describe different methods or properties and do not fit this fact.
_Source: Wikipedia, Winnowing_
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