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问题 单项选择题

CRTSⅠ型板式无砟轨道防水层、隔离层严禁在雨、雪天和五级风及其以上时施工，施工环境温度冷作时不低于5℃，热粘时不低于（）℃

A、-10

B、-5

C、0

D、5

答案

参考答案：A

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 internetworks differ slightly from the idealized graph model. In an internetwork, the goal of the routers to forward packets to various_______ (72). 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. It is possible to use a range of different metrics or costs for the links in a routing protocol. RIP takes the simplest approach, with all link costs being equal _______(74). Thus it always tries to find the minimum hop route. Valid distances are 1 through_________(75) ,This also limits RIP to running on fairly small networks.

空白处____（72）应选择（）

A.computers 

B.routers 

C.switches 

D.networks
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单项选择题

对下丘脑的叙述正确的是（）

A.上界是下丘脑沟

B.即下丘

C.为躯体运动中枢

D.漏斗与松果体相连

E.位于背侧丘脑前上方
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