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【多选题】
关于SSB信号的说法正确的是（ ）。A.
SSB信号可用滤波法和产生
B.
SSB信号的带宽是基带信号带宽的2倍
C.
SSB信号的带宽等于基带信号带宽
D.
对于带宽相同的基带信号，经调制后得到的SSB信号的带宽是DSB-SC信号带宽的一半
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【单选题】Twenty____________ been brought in by villagers.
A.
cattle has
B.
cattles have
C.
cattle have
D.
heads of cattles have
【单选题】( )the villagers here prefer to --- in the cold, which impressed me most.
A.
work on
B.
work at
C.
work for
D.
work out
【单选题】Not until all the fish died in the river _____ how serious the pollution was.
A.
did the villagers realize
B.
the villagers realized
C.
the villagers did realize
D.
didn't the villagers realize
【简答题】句型转换。 1. The villagers built this bridge last year.(改为被动语态) This bridge_____the villagers last year. 2. What delicious food!(用how改写) _____ _____ the food ! 3. The boy is so young that he can't take ca...
【单选题】The villagers were dreaming to have their ownschool,_______ their children could read and write.
A.
which
B.
that
C.
inwhich
D.
in that
【简答题】The villagers had a (celebrate) ____________, with a new film to finish up with.
【简答题】( ) 3. The soldiers soon reached ______ was once an old temple ______ the villagers used as a school.A. which; where B. what; which C. where; which D. what; where
【单选题】As is suggested in paragraph 2， villagers in the past__________. 查看材料
A.
lived a simpler life than villagers today
B.
knew fewer people than villagers today
C.
found it difficult to enjoy themselves
D.
liked to wash themselves with cold water
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