无线上网卡的卡托上有一个ICCID是指的什么?
参考答案:
ICCID为用户卡编码。
The Internet is an open system, and most information is available to everyone. It is very important to add ______ to existing system for protecting the secret information.
A.web pages
B.modem
C.security
D.network
一个栈的入栈序列是a,b,c,d,e,则栈不可能的输出序列是
A.e d c b a
B.d e c b a
C.d c e a b
D.a b c d e