论述国际工程承包业的特点？

Border Gateway Protocol(BGP) is inter-autonomous system （71） protocol. BGP is based on a routing method called path vector routing. Distance vector routing is not a good candidate for inter-autonomous system routing because there are occasions on which the route with the smallest （72） count is not the preferred route. For example, we may not want a packet through an autonomous system that is not secure even though it is shortest route. Also, distance vector routing is unstable due to the fact that the routers announce only the number of hop counts to the destination without defining the path that leads to that （73） . A router that receives a distance vector advertisement packet may be fooled if the shortest path is actually calculated through the receiving router itself. Link （74） routing is also not a good candidate for inner-autonomous system routing because an internet is usually too big for this routing method. To use link state routing for the whole internet would require each router to have a huge link state database. It would also take a long time for each router to calculate its routing （75） using the Dijkstra algorism.

72（）

A．path

B．hop

C．route

D．packet

搬运及装卸重物时，应怎么做？

“梅兰芳先生是我国向海外传播京剧艺术的先驱。他曾于1919年起多次访问日本，1930年访问美国，1935年访问苏联进行演出，展示了中国京剧的神奇魅力，获得巨大成功。”以上材料最能说明：（）

A.我国京剧经过几千年的发展，已走向成熟

B.梅兰芳是“同光十三绝”的著名艺人之一

C.民国时期，梅兰芳为中国京剧走向世界作出了重大贡献

D.艺术交流可以调和国际矛盾，加深各国人民的友谊