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电子商务对安全控制的要求有:()
A. 企业内部网的严密性
B. 数据、信息及交易的完整性
C. 保密性
D. 不可修改性
E. 交易身份的确定性
F. 交易的无争议和不可抵赖性
Rewrite the underlined subordinate clauses.I hope that I shall be able to go there again.I hope to .
He was the first man who flew across the Atlantic.He was the first man to .
I remember that I met him a year ago.Iremember .