以下那种不是GSM系统的控制信道()
A.广播信道(BCH)
B.话音信道(TCH)
C.公共控制信道(CCCH)
D.专用控制信道(DCCH)
参考答案:B
SET电子支付模型中,采用 (34) 公钥算法,生成的数字摘要长度是 (35) 。
(34)处应填()。
A.RSA
B.DES
C.IDEA
D.SHA
Polly observed that she ______ by a tall man in a dark coat when she ______ the faces around her on the train.
A.was watched; stared at
B.was being watched; glanced at
C.was being watched; glared at
D.was watched; looked at