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【单选题】
以下对IP地址分配中描述不正确的是（）A.
网络ID不能全为1，也不能全为0
B.
网络ID不能以127开头
C.
同一网络上的每台主机必须有不同的网络ID
D.
同一网络上的每台主机必须分配有唯一的主机ID
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【简答题】We all like buying our food from supermarkets, don't we? They are so convenient compared to ______________ main street stores and markets. And it offers so many choices. Everything is available all ye...
【单选题】如图所示,不计电压表和电流表的内阻对电路的影响。开关接1时,电压表的读数为( )。
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/f08770dcdceb06b2fbbcac9d4702149a.jpg">
B.
0V
C.
0.2V
D.
1.96V
E.
2V
【简答题】It is very important to have healthy teeth. Good teeth help us to chew our food .They also help us to look nice. How does a tooth go bad? The __51 begins in a little crack in the enamel(珐琅) covering ...
【单选题】We had a very bad journey, the food served on the flight was terrible, ________, we failed to claim our luggage on arrival, they informed us that our luggage had been uploaded on another flight. Can y...
A.
by contrast
B.
what’s more
C.
what if
D.
as well
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