( )是由外国合营者同我国合营者按照我国法律，依据合作双方签订的合作企业合同，在我国境内举办的经济组织。

A．合营企业
B．合资企业
C．独资企业
D．合作企业

Open Shortest Path First(OSPF)is a (8) routing algorithm that (9) work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (10) processing power. The Dijkstra algorithm is used to calculate (11) OSPF routing table updates only take place when necessary, (12) at regular intervals.

8（）

A．distance-vector

B．link-state

C．flow-based

D．selective flooding