咽后脓肿切开术的禁忌证是（） A.幼儿 B.成人 C.并发咽旁脓肿者 D.体温高，全

—Don't _____ our hopes. Things will be fine soon.

—Yes. We should learn to be brave when we are in difficulties. [ ]

A. cheer up

B. give up

C. clean up

D. turn up

制度化，是指在定型的社会生活规范、风俗习惯、礼节仪式和政令法律纪律的基础上，人们将某种行为模式、行为规范内在化和习惯化，从而当他们以某种社会角色出现时，自觉不自觉地按这种行为模式和行为规范行事的现象。
下列不属于制度化的一项是( )

A． * * 每天升国旗的时间与太阳升起的时间一致

B．以后开班会每人都必须自带凳子

C．初恋之中的他们俩隔三差五地去看电影

D．每年祭神的时候，都要从村民中选出一位主祭来念祷文，主持活动

存在于胆囊或胆管中，且后方无声影的回声团不可能为

A．息肉
B．胆泥
C．气体
D．血块
E．肿瘤

公共建筑常用的结构形式有（）

A.空间结构

B.混合结构

C.框架结构

D.充气结构

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. Routingprotocols in internetworks differ slightly from the idealized graph model. In an internetwork, the goal ofthe routers to forward (72) to various networks.
Routers running RIP send their advertisement abOLit cost every (73) seconds. A router also sends an up date 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 simplestapproach, 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 running on fairly small networks.

A．10
B．30
C．60
D．180