吸收直接投资的种类包括( )。 A．吸收国家投资 B．吸收法人资金 C．合资经营 D

一个等差数列共n项，其和为90，这个数列的前10项的和为25，后10项的和为75，则项数n为______．

按照定额编制程序和用途分类，概算定额的编制基础是( )。

A．施工定额

B．预算定额

C．概算指标

D．企业定额

心包积液

A．左室扩大，流出道增宽，室间隔及左室后壁运动减弱
B．室间隔非对称性肥厚，舒张期室间隔厚度与左室后壁之比比1.3:1
C．心前壁之前和心后壁之后有液性暗区
D．瓣叶有赘生物及瓣叶穿孔
E．舒张期二尖瓣前叶呈圆拱状，后叶活动度减弱，交界处融合，瓣叶增厚和瓣口面积减小
下列各种心脏病超声心动图检查显示

蛋白质变性是由于

A．氨基酸排列顺序的改变
B．氨基酸组成的改变
C．肽键的断裂
D．蛋白质空间构象的破坏
E．蛋白质的水解

Border Gateway Protocol(BGP) is inter-autonomous system (96) 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 (97) count is not the preferred route. For example, we may not want a packet through an not secure even though it is the 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 actually defining the path that leads to that (98) . 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 (99) routing is also not a good candidate for inter-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 rousting (100) using the Dijkstra algorism.

（96）是（）

A.routing

B.switching

C.transmitting

D.receiving