A.注冊(cè)碼B.版本號(hào)C.標(biāo)識(shí)碼D.標(biāo)簽
A.把電腦帶到身邊B.對(duì)數(shù)據(jù)進(jìn)行加密C.把數(shù)據(jù)隱藏起來(lái)D.將數(shù)據(jù)備份
A.3B.2C.4D.1