Thay đổi độ trắng của giấy in sách để chống cận thị
"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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