题型:填空题 —I'm surprised to hear that Sue and Paul have__________.—So am I. They seemed very happy together when I last saw them.[ ]A. broken up B. finished upC. divided up D. closed up 查看答案
题型:填空题 以下关于报文摘要的叙述中,正确的是()。A.报文摘要对报文采用RSA进行加密B.报文摘要是长度可变的信息串C.报文到报文摘要是多对一的映射关系D.报文摘要可以被还原得到原来的信息 查看答案