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【单选题】
下列关于多路复用技术的叙述,正确的是________。A.
将多路信号沿同一信道传输,以提高利用率
B.
将多路信号沿多条线路传输,以减少干扰
C.
将同一信号多次传输,以提高传输正确性
D.
将同一信号沿多条线路传输,以提高可靠性
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举一反三
【简答题】用于手工钎焊的 Sn63焊锡丝的熔点只有183°C,从成分上看,Sn63焊锡丝属于()。 A亚共晶合金 B 共晶合金 C过共晶合金 D都不是
【单选题】My old neighbor Charles felt ______ after his children moved out.
A.
lonely
B.
safely
C.
angrily
D.
happily
【单选题】用于手工钎焊的 Sn63焊锡丝的熔点只有183°C,从成分上看,Sn63焊锡丝属于()。 A亚共晶合金 B共晶合金 C过共晶合金
A.
亚共晶合金
B.
共晶合金
C.
过共晶合金
D.
都不是
【单选题】My old neighbor Charles felt__________ after his children moved out.
A.
safely
B.
lonely
C.
happyly
D.
easier
【简答题】On the train I an old lady who happened to be a neighbor of my daughter’s.
【单选题】The old man, my new neighbor, was seen _____ out of the house after the murder.
A.
came
B.
had come
C.
comes
D.
to come
【简答题】One of my. next-door neighbor is a sweet 92-year-old Polish lady. A few days ago, I came back from a trip. As I was 16 . my clothes in my room, I heard a(n) 17 , frantic(发疯的) knock on the door. It was...
【简答题】My new neighbor is an old woman and ________(pension)
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