The Border Gateway Protocol (BGP) is an interautonomous system （71） protocol.The primary function of a BGP speaking system is to exchange network （72） information with other BGP system. This network reachability information includes information on the list of Autonomous System (ASs) that reachability information traverses. BGP-4 provides a new set of mechanisms for supporting （73）interdomain routing. These mechanisms include support for advertising an IP （74） and eliminate the concept of network class within BGP.BGP-4 also introduces mechanisms that allow aggregation of routes, including （75） of AS paths. These changes provide support for the proposed supernettting scheme.

71（）

A．connecting

B． resolving

C． routing

D．supernettting

混凝土试块试压后，某组三个试件的强度分别为26.5Mpa、30Mpa、35.2Mpa，该组试件的混凝土强度代表值为（）Mpa。

A、30.73

B、26.5

C、30.5

D、35.2