电子商务发展中最大的障碍是()
A.安全
B.网络基础设施
C.法律
D.网上支付
参考答案:A
In relation to capital and fi nancing:
(a) Explain the rights and obligations of preference shareholders that must be set out in the Charter of a company imited by shares. (6 marks)
预防拥塞的分组丢弃策略用于()
A.网络层
B.传输层
C.数据链路层
D.表示层