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【单选题】
设加性高斯白噪声的单边功率谱密度为 ,输入信号的能量为E,则匹配滤波器在t=T时刻输出最大信噪比为( )。A.
E/2
B.
E/
C.
2E/
D.
4E/
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举一反三
【单选题】Work hard _____ you can succeed.
A.
in order to
B.
so that
C.
for fear that
D.
in case
【单选题】______ you work hard, you can improve yourself. [ ]
A.
In case
B.
As long as
C.
As far as
D.
Unless
【简答题】简述机场的分类与组成。
【单选题】______ your work in case you've made any mistakes.
A.
Take care of
B.
Ensure
C.
Look out for
D.
Check
【单选题】You ought to have a good rest _____ you've finished the work. [ ]
A.
in case
B.
so that
C.
now that
D.
even though
【简答题】简述机场的种类及划分标准。
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