Vi sao ty le so chan le can bang lai anh huong den tra nghiem su dung sim trong dai han.
So chan dai dien cho am, so le dai dien cho duong. Muc tieu khong phai can bang tuyet doi, ma la can bang phu hop voi menh va nhip sinh hoat cua chu sim.
Neu day so qua lech, he thong se de xuat bo sim thay the co do can bang cao hon.
Neu day so qua lech, he thong se de xuat bo sim thay the co do can bang cao hon.