By saying 'keeps smaller rivals at bay'(Para. 3), the author means the huge capital costs_____.
A．make smaller firms difficult to connect to each other
B．prevent smaller firms from competing with big companies
C．make smaller firms closer to each other than before
D．help smaller firms to compete with big companies

判断题在Excel中,为了区别'数字'与'数字字符串',在输入的'数字字符串&quo

未分类题All of the following are benefits of the deal EXCEPT_____.A．the deal adds TNT' s large regional network to UPS' s vast global oneB．UPS will help TNT Express to thrive soonC．TNT Express' s business in Europe helps UPS to improve its road-freight operationD．UPS may fix TNT Express's business in fast-growing Brazil

判断题文本和表格是不可以相互转换的。（）

未分类题You are preparing for your graduation thesis and are in urgent need of some reference materials. Write a letter to the National Library and ask for their help. Provide detailed information, and method of delivery and payment. 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. Do not write the address.

判断题按照网络的拓扑结构分类，计算机网络可以分为星型网络、总线型网络、环型网络、树形网络和网状网络。()