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网桥的工作原理和特点是什么网桥与转发器以及以太网交换机有何异同
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On the Trial of the Honey Badger On a recent field trip to theKalahari Desert, a team of researchers learn a lot more about honey badgers(獾). The team employeda local wildlife expert, Kitso Khama, to help them locate and follow thebadgers across the desert. Their main aim was to study the badgers' movementsand behavior. as discreetly(谨慎地) as possible, without frightening them away or causing them to changetheir natu-ral behavior. They also planned to trap a few and study them closeup before releasing them. In view of the animal's reputation, this wassomething that even Khama was reluctant to do. "The problem with honeybadgers is they are naturally curious animals, especially when they seesomething new," he says. "That, combined with their unpredictablenature, can be a dangerous mix-ture. If they sense you have food, for example,they won't be shy about coming right up to you for something to eat. They'reactually quite sociable creatures around humans, but as soon as they feel theymight be in danger, they can becomeextremely vicious(凶恶的). Fortunately this is rare, butit does happen. " The research confirmed manythings that were already known. As expected, honey badgers ate any crea-turesthey could catch and kill. Even poisonous snakes, feared and avoided by mostother animals, were not safe from them The researchers were surprised, however,by the animal's fondness for local melons, probably because of their high watercontent. Preciously researchers thought that the animal got all of its liquidrequire-ments from its prey（猎物）. The team also learnt that, contrary to previous research findings, thebadgers oc-casionally formed loose family groups. They were also able toconfirm certain results from previous research,including the fact that femalebadgers never socialized with each other. Following some of the malebadgers was a challenge, since they can cover large distances in a short spaceof time. Some hunting territories cover more than 500 square kilometers.Although, they seem happy to share these territories with other males, thereare occasional fights over an important food source, and male badgers can be asaggressive towards each other as they are towards other spe-cies. As the badgers becameaccustomed to the presence of people, it gave the team the chance to get upclose to them without being the subject of the animal's curiosity-or sudden aggression.The badgers' eating patterns, which had been disrupted returned, to normal. Italso allowed the team to observe more closely some of the other creatures thatform. working associations with the honey badg-er, as these seemed to adopt thebadgers' relaxed attitude when near humans. Why did the wildlife experts visit the Kalahari Desert?A.To find where honey badgers liveB.To observe how honey badgers behaveC.To catch some honey badgers for foodD.To find out why honey badgers have a bad reputation
A.B.C.Although,D.E.TheF.G.ToH.ToI.ToJ.To
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编写一算法，求出一棵二叉树中所有结点数和叶子结点数，假定分别用变参C1和C2统计所有结点数和叶子结点数，初值均为0。
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基金合同生效后，投资者申请购买基金份额的行为被称作是( )。A.申购B.认购C.购买D.赎回
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膜式氧合器使用时PaCO2高，PaO2正常处理是（）
A.减少气流量，增加氧浓度
B.减少气流量，减少氧浓度
C.增加气流量，维持氧浓度
D.增加气流量，增加氧浓度
E.增加气流量，减少氧浓度
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患者男性，36岁。咳嗽、消瘦4月余，加重伴发热1月余，查体：颌下、颈部、腹股沟部触及蚕豆大小淋巴结，X线示间质性肺炎。WBC2．9×109／L，RBC3．2×1012／L...下一步首先应进行的实验室检查是（）
A.HIV抗体检测（化学发光法）
B.HIV抗体检测（免疫印迹法）
C.T细胞亚群检测
D.骨髓象检测
E.血清免疫球蛋白检测
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为什么不能用数字万用电表的电阻档测量电源内阻？
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采煤工作面过的断层：落差较小，顶板、底板或断层面比较平整，而且断层带附近顶板不破碎时，一般采用（）支护方法。
\tA、带帽点柱、棚子支护等支护方式
\tB、一梁二柱或一梁三柱的棚子
\tC、留底煤，在底煤上铺底梁，再在底梁上架设支柱
\tD、搭木垛
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接地棒插入地面深度不够，导致没有有效接地属（）。
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CML-CP的预后评分系统之一Sokal评分系统与下列哪项不相关（）
A.白细胞计数
B.脾脏大小
C.血小板计数
D.年龄
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两台不同形式的可逆热机，工作在两个相同的热源T1与T2之间，这两台热机的热效率（ ）。
A . 相等B . 不等C . 不一定相等D . 无法判断
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人民法院传唤当事人按时出庭的方式是（）。
A.传票
B.电话
C.裁定书
D.支付令
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女性，30岁，经前双乳胀痛，经期即消，检查双乳大小不等的结节状肿物间有索条，质韧，边界不清，可推动，无压痛为进一步检查，下列哪项首选（）
A . A.乳腺管造影
B . B.B超
C . C.CT检查
D . D.取活体检查
E . E.穿刺活检
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在Windows 2003的远程桌面服务中，默认情况下，Administrator具有远程连接到服务器的权利，除此而外，（）组也具有远程连接到服务器的权利。
A.Power User
B.Power Users
C.Remote Desktop User
D.Remote Desktop Users
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下列各组内的物质能否一起共存?若不能共存，则说明原因，并写出有关的化学反应方程式(未注明状态的
下列各组内的物质能否一起共存?若不能共存，则说明原因，并写出有关的化学反应方程式(未注明状态的均指水溶液)。 (1)Sn4+、Sn2+与Sn(S) (2)Na2O2(S)与H2O(l) (3)NaHCO3与NaOH (4)NH4Cl与Zn(S) (5)NaAlO2与HCl (6)NaAlO2与NaOH (7)BiCl3(S)与H2O(l) 分析这是化学知识的综合灵活应用。既要考虑氧化还原性质和反应，又要考虑各类复分解反应。例如某些元素的高低价不能共存(如Sn4+与Sn；MnO2-与Mn2+等)而某些元素的中问价物质却要发生歧化反应；强氧化牲的过氧化钠Na2O2对热是稳定的，遇水则剧烈反应放出O2；BiCl3遇水则立即水解产生氯氧化铋BiOCl白色沉淀，然而水解仍然是可逆的，加水解产物盐酸仍可得澄清的溶液；活泼金属Zn可与NH4Cl水解产生的酸发生置换反应等。
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