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【单选题】
已知4进制数字信号的码元速率为400波特,转换为2进制数字信号的信息速率为( )。
A.
400 b/s
B.
800 b/s
C.
1600 b/s
D.
3200 b/s
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参考答案:
举一反三
【单选题】支水准路线,既不是附和路线,也不是闭合路线,要求进行(  )测量,才能求出高差闭合差。
A.
闭合
B.
附和
C.
往返
D.
双后视
【简答题】A.The class begins at 8:00. B.The man managed to get to classroom on time. C.The man left his book in the store. D.The storekeeper came to the classroom, accompanied by Mr. Brown.
【简答题】I still remember my first day in the U.S. very clearly. My friend was waiting for me when my plane landed at Kennedy Airport at three o’clock in the afternoon. The weather was very and it was snowing,...
【判断题】对于封闭系统,系统与环境之间没有物质交换,只有能量交换。
A.
正确
B.
错误
【判断题】冷拉钢筋不宜用作受压钢筋。 [判断题] *
A.
正确
B.
错误
【单选题】( )年陈光甫将附设在自家银行内的旅行部独立出来,正式成立了中国旅行社,该旅行社也是中国第一家旅行社。
A.
1921
B.
1923
C.
1925
D.
1927
【单选题】听力原文: Four Colombian police officers are dead and at least five more wounded after leftist rebels ambushed a police patrol in the northwestern part of the country. Police officials say about 100 guerr...
A.
northwestern
B.
southwestern
C.
northern
D.
southeastern
【判断题】企业取得新产品要以自主开发为主,不宜采用购买技术的方式。
A.
正确
B.
错误
【简答题】完形填空 Anson Lemmer , a 19­year­old from Glenwood Springs , Colorado , was on his last pizza delivery__ 1 __of the night , on June 15 , when he arrived at a__ 2 __house and found a man lying on the grou...
【简答题】Jim Green works in the hospital. Last weekend he _ _41_ __ go to work. On Saturday morning his father __ _42__ to him, “Jim, go to the city and to see my best friend, Mr Vickers. Here is his 43 . His ...
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