T R A N QUANG K H A N H 1. DAT VAN DE
Phan lan
he thong phan phoi
va truyen tai dien nang a nuac ta la mang dien ngoai trai. chiing luon luon phai chiu sir tac dgng ciia cac dieu kien khi hau
va dia hinh. Sir thay doi cua nhiet do moi truang co the lam thay doi kha nang[r]