现场审核抽样的原则是()
A.公正性
B.随机性
C.代表性
D.以上都是
参考答案:D
—Would you like to buy a car here?
—Yes, but I’d like to buy___________ made in Shanghai.
A.one
B.that
C.it
D.This
下面安全协议中,用于安全电子邮件的是()
A.PGP
B.SET
C.SSL
D.TLS