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【单选题】
网络中子网掩码的目的是什么（）。A.
当没有指定默认网关时，必须要有子网掩码
B.
只有从网络上借用位时，才需要子网掩码
C.
子网掩码用来是别IP地址的网络部分
D.
子网掩码用来将48为地址与OUI和厂商序列号相分割
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【简答题】I was in northern Kenya, which is suffering through the worst drought to hit the Horn of Africa in 60 years. The toll of deprivation is everywhere. In the village of Kursin, emaciated livestock is col...
【单选题】听力原文：W: This is the worst drought ever since the sixties. M: Yes. But it's just the opposite in the south. They have the severest flood for the past 30 years. Q: What do you know about the weather in ...
A.
There is a flood every two years.
B.
The flood is the worst ever since fifties.
C.
There is a serious drought.
D.
There is a severe flood.
【简答题】The United States is suffering its worst drought (干旱) in almost sixty years. The National Climatic Data Center also says high temperatures in June added to the warmest twelve-month period on record. R...
【简答题】There has been an increase in life expectancy and people expect to extend their life s______ with good living conditions.
【简答题】The drought is worst in the central African _______ (国家).
【简答题】Bedroom carpets the dirtiest A shocking research has revealed that the average bedroom floor is ten times dirtier than a toilet seat. The data, compiled by sofa and carpet specialist ScS, found carpet...
【简答题】What is the contrast of Brown’s image between his family life and political life?
【单选题】下列关于酶的叙述 , 正确的是 ( )
A.
酶只有在生物体内才能起催化作用 , 起催化作用的本质是提高反应的活化能
B.
所有酶都含有 C 、 H 、 O 、 N 四种化学元素
C.
人体内的酶进行催化过程中 , 酶本身不变 , 所以酶不会发生自我更新
D.
酶都在核糖体上合成
【简答题】colony forming units称为 (中文名称),是指 培养后,由 或 微生物繁殖而形成的 ,简称为 。通常用 表示。
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