Question

3. The blades and blades form the part of
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Answer 1

Answer:

Rotor Blade. Rotor blades are the most important parts of a wind turbine in terms of performance and cost of the wind power system.

Answer 2

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ʀᴏᴛᴏʀʙʟᴀᴅᴇs ᴀʀᴇ ᴛʜᴇ ᴍᴏsᴛ ɪᴍᴘᴏʀᴛᴀɴᴛ ᴘᴀʀᴛs ᴏғ ᴀ ᴡɪɴᴅ ᴛᴜʀʙɪɴᴇ ɪɴ ᴛᴇʀᴍs ᴏғ ᴘᴇʀғᴏʀᴍᴀɴᴄᴇ ᴀɴᴅ ᴄᴏsᴛ ᴏғ ᴛʜᴇ ᴡɪɴᴅ ᴘᴏᴡᴇʀ sʏsᴛᴇᴍ.