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【单选题】
在彩色电视信号的发送过程中,是将两个色差信号()。A.
调制在同一个副载波上
B.
调制在频率相同，相位差90°的两个副载波上
C.
调制在图象载波上
D.
调制在频率不同的两个副载波上
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举一反三
【单选题】The earthquake may __ landslides that cause great damage and loss of life.
A.
trigger
B.
retreat
C.
emerge
D.
scrape
【简答题】The earthquake may _________ landslides that cause great damage and loss of life.
【简答题】The direct cause of most earthquake-related deaths or injuries is seldom ground movement, but______, flying glass and falling objects.
【简答题】二级维护作业的中心内容是什么?
【单选题】What was the cause of the stampede at a Hindu festival?
A.
An earthquake.
B.
An explosion of bomb.
C.
A fire.
D.
A flood.
【单选题】Lecture B Seismic Waves Which wave is the main cause of the shaking in during an earthquake?
A.
Love
B.
P
C.
Rayleigh
D.
S
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