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【简答题】
下列说法正确的是() A电子商务将对人类社会产生重要的影响，包括提高了企业的准入条件 B企业对政府的电子商务简称为C2G C电子商务较之传统商业具有减少运营成本，显著降低收费的特点 D“电子商务是指对整个贸易活动实现电子化。”这一表述是联合国国际贸易程序简化工作组对电子商务的定义
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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,是一条穿过混乱的公用网络的安全、稳定的隧道
【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
【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.
on one hand
D.
on the other hand
【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
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