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【简答题】
信道带宽为6MHz,信号功率与噪声谱密度之比为6MHz,则信道最大传输速率为______,当信道带宽B趋向无穷大时,则信道最大传输速率为______。
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【单选题】某电感上标有“54R1”,它表示( )
A.
540mH
B.
540uH
C.
54.1mH
D.
54.1uH
【简答题】如图,AC 是圆 O 的直径,点 B 在圆 O 上,∠BAC=30°,BM⊥AC交 AC 于点 M,EA⊥平面ABC,FC//EA,AC=4,EA=3,FC=1. (I)证明:EM⊥BF; (II)求平面 BEF 与平面ABC 所成锐二面角的余弦值.
【单选题】I'm sorry I have ______ dictionary. You'd better go to the library.
A.
not such
B.
not such a
C.
not a such
D.
no such a
【简答题】A. c (CH 3 COO - )> c (Cl - )> c (H + )> c (CH 3 COOH) B. c (CH 3 COO - )> c (Cl - )> c (CH 3 COOH)> c (H + ) C. c (CH 3 COO - )= c (Cl - )> c (H + )> c (CH 3 COOH) D. c (Na + )+ c (H + )= c (CH 3 COO...
【多选题】自然金国内主要产地有哪些?
A.
山东
B.
东北
C.
西北
D.
海南
【单选题】听力原文:M: Is there a service, charge if I open a checking ac- count? W: There is no service charge. Q: Where are the two speakers? (5)
A.
At a restaurant.
B.
At a parking lot.
C.
At a bank.
D.
At a supermarket.
【简答题】根据电影片段将下列句子补充完整并写出电影的英文片名 (1) Ladies and gentlemen. The children of Captain von Trapp wish to say good 1 to you. There’s a sad sort of clanging from the clock in the hall. And the bells in the steeple...
【单选题】I’m taller than Mike ___ head.
A.
to a
B.
by a
C.
for the
D.
in the
【单选题】1911 年 4 月,资产阶级革命党人在黄兴率领下举行了( )
A.
镇南关起义
B.
七女湖起义
C.
黄花岗起义
D.
惠州起义
【单选题】I doubt whether this _______ would be authorized
A.
proposal
B.
promise
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