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问题 选择题

下列物质质量最接近50g的是（　　）

A．一名中学生

B．一只鸡

C．一个鸡蛋

D．一张课桌

答案

手握两个鸡蛋的力大约1N，得到两个鸡蛋的质量为100g，所以一只鸡蛋的质量大约50g．

故选C．

选择题

Tonight we're _____ to a thirteen year old boy.[ ]

A. telling

B. saying

C. talking
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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 (1) algorithm．Routing protocols in internet works differ slightly from the idealized graph model．In an internet work，the goal of the routers to forward (2) to various networks．

Routers running RIP send their advertisement about cost every (3) 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 (4) 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 (5) ．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．

2（）

A．data frames

B．segments

C．packets

D．messages
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