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【多选题】
数字通信系统的构成模型中信源编码和信源解码的作用是:A.
信源编码的作用把模拟信号变换成数字信号
B.
完成模/数变换
C.
信源解码的作用把数字信号还模拟信号
D.
完成数/模变换
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举一反三
【单选题】According to text, what is beyond the ability of Europe's failing firms now is ______.
A.
to defect American competitive rivals.
B.
to comply with different laws.
C.
to escape the control of governments.
D.
to negotiate with their creditors.
【简答题】当一束自然光以布儒斯特角入射到两种媒质的分界面上时，就偏振状态来说反射光为__________光，其振动方向________于入射面．
【单选题】Which of the following is implied in the text?
A.
Europe as a whole turns its back on poor immigrants.
B.
European countries have a standard for political safety.
C.
Germany only handles applications of persecuted migrants.
D.
Other European governments will follow Germany's suit.
【简答题】自然光以布儒斯特角入射到两种媒质的分界面上时,就偏振状态来说反射光为完全偏振光,其振动方向 _______ 于入射面。
【简答题】当一束自然光以布儒斯特角入射到两种媒质的分界面上时，就偏振状态来说反射光为（）光，其振动方向（）于入射面。
【单选题】It can be inferred from the text that Europe's quest for more liberal economies may be ______.
A.
popular and sensible.
B.
dubious but profitable.
C.
slow and contradictory.
D.
fragile but promising.
【单选题】We can learn from the text that road accidents in Europe are mainly caused by _____.
A.
drivers falling asleep at the wheel
B.
long-distance lorry driving
C.
cars without a safety system
D.
drivers' sudden changes in steering
【单选题】In the last six to nine months，teens in the US to text messaging in numbers twice that in Europe and Asia．
A.
took
B.
have taken
C.
had taken
D.
would take
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