Thay đổi độ trắng của giấy in sách để chống cận thị
Cập nhật: 07:15 30/08/2013 GMT+7
"Nhà xuất bản Giáo dục Việt Nam đã chỉnh sửa loại giấy in ấn sách, từ giấy có độ trắng 80-82 ISO trước đây sang loại có độ trắng 73-75 ISO, để đảm bảo chống loá...
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u5HhuqPhu43DqeG7neG6o3bhuq3huqPhu63hu43DteG6reG6o3fhuq15My8zNy/hu604WOG7jcOt4buj4bqjJuG7j8OteOG7neG6reG7mys3L+G7rTg=