SB20 applies only to CRT, LCD and plasma screens larger than four inches measured diagonally. SB50 extended coverage to products refurbished by the manufacturer for retail sale.是什么意思_SB20 applies only to CRT, LCD and plasma screens larger than four inches measured diagonally. SB50 extended coverage to products refurbished by the manufacturer for retail sale.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句