考虑到铁路数据业务的需要，对于一个平均包长的IP包而言，IP传输时延应（）80ms.
A.小于或等于
B.大于或等于
C.等于
D.大于
参考答案：A
We don’t allow ___in the office. But you are allowed ____in the rest room.
A．smoking, smoking
B．to smoke, to smoke
C．smoking, to smoke
D．smoke, smoking
请说出按园林风格分类的我国四种古典园林？
