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When I was a college student, I did a lot of traveling abroad. That was because a professor 小题1: me to do so. She said, “Now it is the time for you to travel around the world, 小题2: your knowledge through actual experiences and have fun?” I 小题3: her. Since I started to work for a 小题4: company, however, I have done most of my traveling through the Internet. By using the Internet, I have seen the 小题5:  of many cities on my computer screen. And I have really made business 小题6: , too. With the help of the Internet, I have also got 小题7: about food in different countries. Therefore, I was beginning to feel that actual trips were 小题8: necessary when I happened to read a famous chef's (厨师) comment on the Internet. He said, “It is very difficult to have real Italian food in a foreign country, because we enjoy food and the 小题9: around us at the same time. So why don't you fly over to Italy and enjoy real Italian 小题10: ? “Those words reminded me of my 小题11: advice. As information technology 小题12: , you might be able to do without making some real trips. But this also means that you will miss the various 小题13: you can get from traveling. Today there are people who 小题14: direct communication with others and spend much of their time on the Internet. It is not surprising to see a group of people 小题15: not with each other but into their micro phones. It seems as if such people are 小题16: by an invisible wall. They seem to be losing out on a good chance to 小题17: and talk with other people. I do not think that they are taking good advantage of information technology. We should use information technology as a tool to make our daily 小题18: more fruitful. However, we should never let it 小题19: our time for face to -face communication. Let's make use of information technology more 小题20: , and have great fun in experiencing the actual world. 小题21: A.promised B.allowed C.hurried D.encouraged 小题22: A.build up B.use C.practise D.exchange 小题23: A.agreed with B.learned from C.followed D.obeyed 小题24: A.car B.food C.clothing D.machine 小题25: A.life B.rivers C.sights D.houses 小题26: A.plans B.bargain C.progress D.trips 小题27: A.information B.taste C.cooks D.feelings 小题28: A.even more B.no longer C.much D.actually 小题29: A.people B.drink C.atmosphere D.environment 小题30: A.shoes B.dishes C.customers D.situations 小题31: A.friend's B.parents' C.professor's D.boss's 小题32: A.produces B.advertises C.forms D.advances 小题33: A.news B.pleasures C.troubles D.places 小题34: A.avoid B.keep C.lose D.enjoy 小题35: A.meeting B.talking C.communicating D.traveling 小题36: A.stopped B.met C.surrounded D.hurt 小题37: A.look at B.employ C.travel D.meet 小题38: A.communication B.study C.work D.action 小题39: A.spare B.increase C.reduce D.make use of 小题40: A.wisely B.correctly C.or less D.slowly
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【多选题】对于自治系统边界路由器ASBR,下列描述正确的是()
A.
ASBR是将其他路由协议(包括静态路由和直接路由)发现的路由引入到OSPF路由器
B.
ASBR不一定要位于AS的边界,而是可以在自治系统中的任何位置(Stub区除外)
C.
ASBR为每一条引入的路由生成一条Type3类型的LSA
D.
若某个区域内有ASBR,则这个区域的ABR在向其他区域生成路由信息时必须单独为这个ASBR生成一条Type4类型的LSA
【判断题】在OSPF 中,由于ASBR 是AS 边界路由器,因此它在拓扑结构上必须位于自治系统的边界,才能引入外部路由。
A.
正确
B.
错误
【单选题】已知频带宽度有限信号 x 1 (t) 和 x 2 (t) 的最高频率分别为 f 1 和 f 2 ,其中 f 1
A.
2f 1
B.
2f 2
C.
2f 1 +2f 2
D.
2f 1 f 2
【简答题】There is ( ) new desk and a new chair . W elcome ( ) my new home. L ook ( ) my new home. There is a new desk and a new chair ( ) my bedroom .
【简答题】How much will a new chair cost?
【多选题】关于OSPF协议中LSA的传递范围,下列说法中正确的是()
A.
Router LSA(Type=1)只在区域内传递,其它区域中不会出现非本*区域的Router LSA;
B.
Network LSA(Type=2)只在其内容所描述的网段内传递,其它网段中不会出现非本*网段的Network LSA
C.
Network Summary LSA(Type=3)只在相关区域内传播,相关区域是指生成该LSA的ABR(区域边界路由器)所属的所有区域
D.
ASBR Summary LSA(Tpye=4)在整个自治系统内传播,STUB区域除外
E.
AS External LSA(Tpye=5)在整个自治系统内传播,STUB区域除外
【多选题】对于自治系统边界路由器ASBR,下列描述正确的是( )
A.
ASBR是那些将其它路由协议(也包括静态路由和接口的直接路由)发现的路由引入(redistribute)到OSPF中的路由器
B.
ASBR不一定要位于AS的边界,而是可以在自治系统中的任何位置(Stub区除外)
C.
ASBR为每一条引入的路由生成一条Type3类型的LSA
D.
若某个区域内有ASBR,则这个区域的ABR在向其他区域生成路由信息时必须单独为这个ASBR生成一条Type 4类型的LSA
【判断题】反转录病毒侵染常常同时导致子代病毒的非致死释放和被侵染细胞内致癌的永久性基因改变。
A.
正确
B.
错误
【单选题】实训楼顶装机容量为10MW,并入国家电网,该种类型光伏电站属不属于分布式光伏电站。
A.
属于
B.
不属于
【简答题】有限频带信号f(t)的最高频率为100 Hz,若对下列信号进行时域取样,求最小取样频率fs。 (1)f(3t) (3)f(t)*f(2t)
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