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【单选题】
在直流电源中,滤波电路的作用是A.
将电网电压变换为合适的交流电压
B.
将交流电压变换成单向脉动的直流电压
C.
将单向脉动的直流电压变换成比较平滑的直流电压
D.
使输出电压在电网电压波动或负载变化时均保持稳定
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【简答题】Preparatory Lesson Five A. Coins. How much do you know about the following? In American currency: (a) a penny = 1 cent, (b) a nickel = 5 cents, (c) a dime = 10 cents, (d) a quarter = 25 cents. Now lis...
【单选题】The name of the government for the Southern States during the American Civil War was
A.
Federal Government of America
B.
Central State of America.
C.
Confederate Government of America.
D.
Confederate States of America.
【简答题】搜集就业信息时需要注意哪些方面的问题
【单选题】Which of the following is NOT tree about the people during the American Revolution?
A.
Most of the people went on doing their own business.
B.
Most of the people were not seriously disturbed by the war.
C.
Many of the people scarcely knew that a war was on.
D.
Most of the people devoted their life to the revolution.
【单选题】The Presidents during the American Civil War was
A.
Andrew Jackson
B.
Abraham Lincoln
C.
Thomas Jefferson
D.
George Washington
【单选题】During the American Civil War, those who demanded immediate liberation of black slaves were called
A.
freedom riders.
B.
liberation group.
C.
Democrats.
D.
abolitionists.
【判断题】During the American Revolution in 1776, George Washington had his headquarters for a time in New York City. ()
A.
正确
B.
错误
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