下面关于SIP的描述,()是正确的。
A.每次接入得到不同的IP地址
B.跨PDSN切换将导致连接的中断
C.只能支持用户端主动发起的业务
D.以上都是
参考答案:D
Directions: You wish to study at a certain foreign university. Write a letter to the admissions office of the university to ask for:
1) accommodations,
2) fees, and
3) qualifications.
You should write about 100 words on ANSWER SHEET 2. Do not sign your own name at the end of the letter. Use "Li Ming" instead. You do not need to write the address. (10 points)