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{{B}}How Sled Dogs Work{{/B}} They’re physical wonders-able to endure extreme conditions for extensive periods of time while running fast and pulling more than their own weight. Sled (雪橇) dogs have been around for generations, and today they remain a large part of a dog driver’s life. In Arctic (北极的) regions, some 35 000 years ago, Eskimos’ dogs bred with wolves and other dogs. Their offspring were well-adapted to the cold and snow. There’s no saying exactly when someone thought to have dogs pull sleds, but it was well before 1000 B. C. that dog sleds provided a means of transportation and a way to haul goods. In recent years, people looking for unique outings have gone on recreational trips with sled dogs. A number of companies market tourist treks via dog sled for adventure travelers. Dogsl A. there are severe weather conditions B. flying machines are full with passengers C. snow machines use up power in the Arctic region D. people need partners during the travel [单选题]下列行为中，不构成帮助恐怖活动罪的是（）
A.甲给予恐怖活动组织“红心会”10万美元; B.乙无偿给予恐怖分子张某价值30万元的汽车一辆; C.丙应邀参加恐怖活动，负责制造10枚炸弹，其还在火车站实施爆炸2起，造成3名无辜群众死亡; D.丁积极为某恐怖活动组织招兵买马 [单选题]汛期因降雨量达到封锁警戒值，多站多区间封锁后，开行轨道作业车（单机）检查线路时，轨道作业车（单机）由封锁区段内的车站发车，遇出站（发车进路）信号机不能开放时，按（ ）有关规定办理。
A.向封锁区间开行路用列车 B.向封锁区间开行轨道车 C.向区间开行轨道车 D.向区间开行路用列车 [单项选择]The visual part of the cortex is especially interesting because __________.
A. specific layers of neurons are sensitive to particular orientations of input Stimuli B. much of the structure is genetically predetermined C. horizontal lines are stimulated D. vertical lines are stimulated [单选题]在不同导体的分界面上，电流点的法向分量（ ），电场强度的切向分量（ ）。
A. 连续、连续 B. 连续、不连续 C. 不连续、不连续 D. 不连续、连续 [多项选择]承担法律责任的主体包括（）。
A. 公民 B. 法人 C. 机关 D. 企业 E. 其他社会组织 [单选题]以下哪项不是糖皮质激素的药理作用
A. 抗炎作用 B. 抑制免疫作用 C. 抗毒作用 D. 中枢抑制作用 [多项选择]换流变除了要进行与普通交流变压器一样的型式试验与例行试验之外，还要进行直流方面的试验，如（）。
A. 直流电压试验 B. 直流电压局部放电试验 C. 直流电压极性反转试验 D. 以上都不正确 [单项选择]
You know you should do it, other people do it all the time. Maybe you’ve already done it but it wasn’t very satisfying, and you’d like to learn to do it better. [单选题]除了能学会有节奏地跟着音乐做动作外，还能初步了解并辨别不同风格音乐的基本性质的幼儿，其年龄阶段是( )。
A.2～3岁 B.3～4岁 C.4～5岁 D.5～6岁 [判断题]防火墙的安全管理功能主要是指身份认证和日志审计。（）
[单项选择]Mary was very fond of television, so when she met a young man (36) worked for a television company, she was very (37) and asked him a lot of questions. She discovered that he had also worked for a film company, so she asked him (38) there was any difference (39) film work and television. " (40) ," answered the young man, "there is one very big (41) . If someone makes a (42) while a film is being made, it is, of course, (43) to stop and do the scene again. In fact, one can do it over and over again a lot of (44) . Mistakes (45) time, money and films, but the audience (观众) who see the film (46) it is finished don’t know that anything went wrong. In a live (实况播送的) television show, (47) the audience can see any mistakes that are made. I can tell you a story about that. (48) ,a live television show (49) and one of the actors was supposed (50) . He fell to th
A. ground B. actors C. stage D. camera [单选题]货物列车站内停车申请特殊前行时，须预留20 m的安全距离，速度控制在（ ）以下。
A.5 km/h B.8 km/h C.10 km/h [单选题]急性胰腺炎病情严重的重要指标是：
A. 血白细胞>15*109/L
B. 血糖超过200mg/
A.l，尿糖阳性 B.血淀粉酶>256U（温氏法） C.血钙＜1. 75mmol/L（7mg/ D.l） E.血清脂肪酶>1. 5U [判断题]3.199. 第199题
变压器铜损的大小与电流的平方成正比。 A.正确 B.错误 [判断题]安全设施与建设项目主体工程未做到同时设计的可以先行审批补办手续.未做到同时施工的责令立即停止施工.未同时投人使用的不得颁发安全生产许可证.并视情节追究有关单位负责人的责任. ( )
A.正确 B.错误 [判断题]车挡设置在线路终端的车挡上，昼间一个红色方牌；夜间显示一个红色灯光。
A.正确 B.错误 [单项选择]
Networks can be interconnected by different devices. In the physical layer, networks can be connected by (1) or Hubs, which just move the bits from one network to an identical network. One layer up we find bridges and swiches, which operate at data link layer. They can accept (2) ,examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two netwoks. If two networks have (3) network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between the two transport connections. Finally, in the application layer, application gateways translate message (4) . As an example, gateways between Internet e-mail and X. 400 e-mail must (5) the e-mail message and change various header fields. 2（）A. frames B. packets C. packages D. cells 我来回答: 提交
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