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【单选题】
闭路电视系统传送视频信号的传输方式有基带传输和调制传输两种方式，下面说法正确的是（）。A.
基带传输是将视频信号调制到高频载波上通过同轴电缆传输
B.
基带传输可以实现同一条同轴电缆传输多路视频信号
C.
调制传输可以实现同一条同轴电缆传输多路视频信号
D.
调制传输是将视频信号直接通过同轴电缆传输
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【单选题】On November 19, 1863, Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery. The Civil War was still going on. There was much criticism of President Lincoln at ...
A.
very critical
B.
unpopular
C.
very popular
D.
very courteous
【简答题】历史观中唯意志论的错误在于把人类历史看作是( )。 A由人的意志决定的 B历史发展无所谓规律性 C由人的意志可任意改变的 D客观精神的进程，是不由人的意志决定的
【单选题】On November 19, 1863, Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery. The Civil War was still going on. There was much criticism of president Lincoln at ...
A.
very critical
B.
unpopular
C.
very popular
D.
very courteous
【单选题】The United Nations was ______ forty years ago and held a special conference in November 1985 to celebrate.
A.
established
B.
set
C.
completed
D.
settled
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