身份认证因子应从以下几类中选取()。
A.口令类。如USBKey
B.证书类。如X.509标准证书
C.令牌类。如动态口令
D.生物特征类。如指纹识别
参考答案:A, B, C, D
—John, how old is your grandfather?
—_______ We had a party for his _______ birthday last week.[ ]
A. Eighty; eightieth
B. Eighty; eighty
C. Eightieth; eighty
D. Eightieth; eightieth
歼轰-7采用惯性导航、GPS导航和多普勒导航系统,导航定位精度高。