为保证电子商务交易的有效性,在技术手段上必须要
A.采用加密措施
B.反映交易者的身份
C.保证数据的完整性
D.提供数字签名功能
E.保证交易信息的安全
正确答案是CD
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
The earthquake-stricken area received ( ) help from its neighboring provinces. (time)
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