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【判断题】
一个向量线性相关当且仅当这个向量是零向量。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】Write a composition on the topic 'Air Pollution.' Start writing your composition with the topic sentence: 'There is obviously a very serious problem of pollution in our cities nowadays.' You are suppo...
【简答题】_______被定义为通过一个公用网络建立一个临时的,安全的连接,是一个穿过公共网络的安全、稳定的通道。
【简答题】Write a composition on the topic 'Fighting Criminals.' Start writing your composition with the topic sentence: 'Today the crime rate in some cities of our country is rising.' You are supposed to write...
【单选题】The law of constant composition says __________.
A.
that the composition of a compound is always the same
B.
that all substances have the same composition
C.
that the composition of an element is always the same
D.
that the composition of a homogeneous mixture is always the same
E.
that the composition of a heterogeneous mixture is always the same
【单选题】There are some spelling mistakes in your composition, but your composition is good. [ ]
A.
as a whole
B.
on the whole
C.
first of all
D.
generally speaking
【简答题】( )是指人顺利完成某种活动所必须具备的，并且直接影响活动效率的个性心理特征。A气质 B能力 C个性 D性格
【单选题】虚拟专用网(VPN)被定义为通过一个公用网络（通常是因特网）建立一个临时的、安全的连接，是一条穿过混乱的公用网络的安全、稳定的隧道。虚拟专用网是对（）的扩展。
A.
企业内部网
B.
企业外部网
C.
局域网
D.
广域网
【简答题】空山新雨后
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