WORD中动态效果可以打印。（）

Open Shortest Path First(OSPF)is a (71) routing algorithm that (72) work done on theOSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing,requires (73) processing power. The (74) algorithm is used to calculate mutes. OSPFrouting table updates only take place when necessary, (75) at regular intervals.

A．distance-vector

B．link-state

C．flow-based

D．selective flooding

长方形的面积是375平方米，已知宽比长少10米．长方形的周长是______米．

砖砌体结构中的砂浆主要作用是（），使上层砖的荷载均匀的传递到下层。

A.粘结

B.填充砖间空隙

C.增加结构的整体性

简述电捕焦油器的清扫步骤。