如图标志的含义是什么()
A.傍山险路
B.注意行人
C.注意儿童
D.施工
参考答案:D
能够提供可变业务速率的专线业务是()。
A.DDN
B.SDH
C.WDM
D.ATM
We are delighted to establish business relationship with you.
A.be established
B.establishing
C.be establishing
D.have established