在CyberCash信用卡支付系统中,为了使银行卡在网上支付过程中真正实现交易安全和支付的不可否认性,采用( )是不可缺少的步骤。
A.SST
B.ChinaPay
C.SET
D.SAT
正确答案是C
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Complete the following sentence with a (compound) word derived from the one given in bracket.
He has a strong accent and I have much( )in following what he says. (difficult)
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