Why people in helicopter usually wear...

2008-02-23 10:10 pm
I am ambiguous that why people in the helicopter usually wear a kind of Ear Protector or headphone during the flying. However, what are the actual functions of it?

回答 (1)

2008-02-24 4:11 am
✔ 最佳答案
rotation of propellors make a helicopter move.

but the rotation of propellors is very noisy.

so ear protector can protect the ear from damage.


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