一个完整的呼叫接通率有多个层次包括（）。A.登记成功率 B.寻呼成功率 C.RRC连

一个长方体的底面是边长为4厘米的正方形，高是7厘米，这个长方体的体积是（    ）立方厘米。

单词拼写。

1. The boy finally _____ (承认) having cheated in the examination.

2. His suggestions are well ______ (值得) considering.

3. I recognised him immediately he ______ (摘下) his dark glasses.

4. I think the handbag I bought yesterday was a real ______ (便宜货). 

5. ______ (就我个人而言), I think mobile phones can offer much convenience to middle school students.

对n个记录的文件进行归并排序，所需要的辅助存储空间为

A．O(1)

B．O(log₂n)

C．O(n)

D．O(n²)

程序图中1DF，2DF、3DF、DFI、DF2、DF3、DF4、DF5、DF7、DF8及DF9等符号的含义是什么？

通常形状比较规则的冰山如平顶冰山，其水上部分与水下部分的高度比约为（）

A.1/1

B.1/2

C.1/3

D.1/7~1/5