()是TCP/IP族中最为核心的协议。
A、IP
B、TCP
C、UDP
D、ICMP
参考答案:A
Nowadays, more film stars ______ to be difficult to work with.[ ]
A. say
B. have said
C. are said
D. were said
在下列几种排序方法中,要求内存量最大的是( )。
A.插入排序 B.选择排序C.快速排序 D.归并排序