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【简答题】
计算 其中L为圆周x 2 +y 2 =4x
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举一反三
【单选题】Choose the best answer to each of the following questions. Why did Emperor Qin build the Great Wall?
A.
To create a wonder in the world.
B.
To punish the people who disobeyed him.
C.
To protect his empire from attack.
D.
To show off the strength of his empire.
【多选题】对于初学扬琴的练习者,用练功槌练习基本功有( )等几方面的作用。
A.
巩固正确的演奏方法和持竹手型
B.
培养手臂自然下垂的习惯
C.
加强腕指主动性
D.
掌握与完善演奏基本动作
【单选题】Which three countries did Qin Shihuang link up to build the Great Wall?
A.
Qin, Zhao, and Wei
B.
Qin, Zhao, and Yan
C.
Han, Zhao, and Yan
D.
Qin, Chu, and Yan
【简答题】Why was Qin able to build roads all over China ?
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