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【判断题】
For AWGN channel, 16-PSK requires less signal energy than the 16-FSK for the fixed noise power spectrum density and symbol error rate.A.
正确
B.
错误
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举一反三
【简答题】The storm ________(blow)down the big tree last night.
【单选题】Last night the storm was so heavy that the roof of the small house was blown ______.
A.
over
B.
in
C.
of
D.
off
【单选题】听力原文：M: The storm last night damaged some of the neighbors' roofs. W: I don't wonder. Q: What does the woman mean? (14)
A.
She doesn't understand.
B.
She wonders how many roofs were damaged.
C.
She isn't surprised.
D.
She closed the windows to prevent damage.
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