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问题 单项选择题

如果函数没有返回值，对于函数的返回值说明可以是( )。

A．可能没有返回值说明

B．用void说明

C．用const说明

D．返回值可以是任意类型

答案

参考答案：B

解析： 如果函数没有返回值，则对于函数的返回值说明用void。

填空题

刘天华，（）人，在民族器乐创作，演奏和音乐教育方面成就显著。作有（）等二胡曲。
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单项选择题

One of the most widely used routing protocols in IP networks is the Routing Information Protocol (RIP)．RIP is the canonical example of a routing protocol built on the (71) algorithm．Routing protocols in internet works differ slightly from the idealized graph model．In an internet work，the goal of the routers to forward (72) to various networks．
Routers running RIP send their advertisement about cost every (73) seconds．A router also sends an update message whenever an update from another router causes it to change its routing table．
Routing protocols use different techniques for assigning (74) to individual networks．Further, each routing protocol forms a metric aggregation in a different way．RIP takes the simplest approach，with all link costs being equal (75) ．Thus it always tries to find the minimum hop route．Valid distances are 1 through 15．This also limits RIP to runing on fairly small networks．

A．data frames
B．segments
C．packets
D．messages
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