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【单选题】
R1与R2是一个自治系统中采用RIP路由协议的两个相邻路由器,R1的路由表如图6-72(a)所示。如果R1收到R2发送的如图6-72(b)所示的(V,D)报文,更新之后的R1的4个路由表项的距离从上到下依次为0、4、4、2,那么图6-72(b)中a、b、c、d可能的数据一个是A.
1、2、2、1
B.
2、2、3、1
C.
3、3、3、1
D.
4、4、3、2
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【单选题】From the passage it can be assumed that wind energy is better because ______.
A.
it is cheaper than electric power
B.
it does not alter the environment as much as other types of power
C.
it lasts longer than electric power
D.
it is more efficient than electric power
【单选题】It is possible that the weather of the world may be changing. Some scientists imagine that this could even mean the beginning of another ice age. The effects of such a change in weather on human popul...
A.
hotter
B.
colder
C.
warmer
D.
freezing
【判断题】It is now believed that the comet is produced by the combined action of the solar wind and the inter-planetary magnetic field.
A.
正确
B.
错误
【简答题】The solar wind distorts the earth's magnetic field，so that it is dragged out to a long tail．
【简答题】Sailing You may think that sailing is a difficult sport, but it is really not hard to learn it. You do not need to be strong. But you need to be quick. And you need to understand a few basic rules abo...
【单选题】According to this article, it is clear that the force of the moon
A.
is not as important as that of the wind
B.
is less than half as much as the sun
C.
causes the alternate rise and fall of the surface of the seas
D.
does not influence the rise and fall of the surface of the seas
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