数字证书
参考答案:是电子邮件附件或嵌在网页上的程序,可用来检验用户或网站的身份,它具有向网页或电子邮件附件原发送者发送加密信息的功能。
已知全集U=R,集合A={x|lgx≤0},B={x||x+1|>1},则(CUA)∩B= [ ]
A.(﹣2,1)
B.(﹣∞,﹣2]∪(1,+∞)
C.[﹣2,1)
D.(﹣∞,﹣2)∪(1,+∞)
I'm surprised to see you smoking. You ________, I remember. [ ]
A. are not used to
B. were not used to
C. didn't use to
D. used not