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越南也有十二属相。越南人阮孟雄先生与中国姑娘林美卿恋爱结婚，林的属相是羊，而阮比她大整整四岁，据越南的十二属相，阮属猫。据此可知，越南属相中的猫就是中国属相中的（）

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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
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甲有一条驳壳船租与乙进行海上运输，租期3年。双方签订了书面合同，乙一次性向甲交付租金50万元。租赁的第二年，甲因资金紧张将该船卖与丙，双方签订了买卖合同，价格500万元。约定在乙的租期届满前，丙付清全部款项。因甲无法现实交付，双方约定租期届满，由丙向乙行使返还请求权，并由甲通知乙。合同签订后10日内，甲办理了该船的过户登记。丙买得该船后，因资金紧张向丁借款250万元，丙以该船进行抵押，但未办理登记。后丙向戊借款250万元，丙通知乙该船质押于戊。后丙又将该船卖给庚，并通知乙将该船交给庚，且办理了过户登记。租赁期间第二年届满时，该船遇不可抗力灭失(该船未保险)而引起纠纷，请回答下列问题：

该船灭失的风险责任应由谁承担为什么
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