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【单选题】
以下哪个描述不是关于 VPN 的描述A.
VPN 的实施需要租用专线，以保证信息难以被窃听或破坏。
B.
VPN 需要提供数据加密、信息认证和访问控制。
C.
VPN 的主要协议包括 IPSec 、 PPTP/L2TP 、 SSL 等。
D.
VPN 的实质是在共享网络环境下建立的安全“隧道”连接，数据可以在“隧道”中传输。
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皮皮学刷刷变学霸
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【简答题】阅读理解 The question of what children learn,and how they should learn,is continually being debated and redebated.Nobody dares any longer to defend the old system,the learning of lessons parrotfashion, th...
【简答题】Students in many countries are learning English. Some of these students are small children. Others are agers. Many are s. Some learn at school, others by themselves. A few learn English by le...
【简答题】阅读理解 The question of what children learn, or how they should learn, is continually being debated. Nobody dares to defend the old system, the learning of lessons parrotfashion, the grammarwitha...
【单选题】From the text we learn that small children ______.
A.
have little control of themselves
B.
usually steal things but grow up honest
C.
are usually kleptomaniacs
D.
like to give things away
【简答题】如何利用生物化学方法鉴定麦芽糖和蔗糖的还原性?
【单选题】Small children learn by__their parents.
A.
obeying
B.
observing
C.
behaving
D.
imitating
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