A.应提供访问控制服务以防止用户否认已接收的信息
B.应提供认证服务以保证用户身份的真实性
C.应提供数据完整性服务以防止信息在传输过程中被删除
D.应提供保密性服务以防止传输的数据被截获或篡改
第1题
【38】
A.pay attention to
B.match
C.coordinate
D.take notice of
第2题
【B18】
A.pay attention to
B.get down to
C.be used to
D.look forward to
第3题
A.Pay attention to others' self-esteem.
B.Be a good listener.
C.Behave in a determined way.
D.Be specific.
第4题
A.pay attention to
B.get down to
C.be used to
D.look forward to
第5题
We wish to ______ your attention to the fact that the date of delivery is approaching.
A.pay B.draw C.push D.put
第7题
A.Pay attention to others' self-esteem.
B.Be a good listener.
C.Behave in a determined way.
D.Be specific.
第8题
We should________attention________spelling.
A.pay,on
B.pay,for
C.pay,of
D.pay,to
第9题
【B18】
A.pay attention to
B.get down to
C.be used to
D.look forward to
第10题
A.Pay for the lost books.
B.Reconfirm with the library that the books were returned.
C.Check to see if the books are still at her home.
D.Check to see if the books are at Henzer's place.
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