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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4bq34bqk4bu5ZuG7t+G6t8Os4bq5ceG6t8Sp4bq74bq34bu14bq24bq34buJw4Bx4buR4bq34buhcsOp4buZ4bq34buR4buZZuG6puG6t3Dhu63hu5nhurfhurRl4bq34bu1xJHhu4vhu5PhurfEqeG6u+G6t8SpxJF54bq3xIJx4buR4bq3w6zhurly4bq3xKnhurlw4bq34buL4buT4bunceG7keG6t+G7oXLEkTfhurfhu7fhur1x4buR4bq3xKnGsOG6t+G6pOG7p3nhurfhurRl4bq34buZceG6t+G7n+G7k+G7pXHhu5HhurfDrMah4bq34buT4bq/ceG6t+G7s2Thurd54buT4buVZOG6t+G7tWThu7k4LzjDoC954bqh4bu24buTanLhurcu4buZauG7t3FkcCvDoC954bqh