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【简答题】
随着科学习技术的发展，电动自行车已成为大众化的一种交通工具，和他爸爸在一段平直公路上对家里的电动自行车进行了测试，若电动自行车在行驶过程中消耗的电能有75%转化成机械能，电动机的额定功率是240W，正常工作时电流为5A，求 （1）电动机正常工作时电压是多少? （2）骑着电动自行车测试时，电动自行车以额定功率在平直公路上行驶，获得了速度V随时间t变化的关系图像，如图所示，此过程中电动自行车的牵引力是多大? （3）若测试中电动自行车一直以额定功率行驶，骑着电动自行车匀速经过一段平直公需要1min，的爸爸骑车时受到的阻力是骑车时的1．2倍，的爸爸骑车匀速经过同一路段需要多少时间？
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参考答案：
举一反三
【单选题】φ 50H8的孔与 φ 49f7轴两者 ( ) 。
A.
可以形成基孔制间隙配合。
B.
可以形成基孔制过渡配 合。
C.
可以形成基孔制过盈配合。
D.
不属于配合。
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【简答题】Who answers Li Ming's call?
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【单选题】Marshall burned her business suit and went on courses to learn more. Did Marshall really burn her business suit?
A.
Yes,she did.
B.
No, she just throw away her suit.
C.
No. She resigned.
D.
We don't know.
查看完整题目与答案
【单选题】Who is the tallest?
A.
Li Ming.
B.
Tom.
C.
Jim.
查看完整题目与答案
【单选题】变压器运行时,其绕组和铁芯产生的损耗转变成( ),一部分被变压器各部件吸收使之温度升高,另一部分则散发到周围介质中。(1分)加油!必过!
A.
热量
B.
有功
C.
无功
查看完整题目与答案
【单选题】The business suit generally includes_______.
A.
business suit, short-sleeved and collard shirt, dress pants and tie and leather shoes
B.
business suit, long-sleeved and collard shirt, dress pants and tie and leather shoes
C.
smart suit, long-sleeved and collard shirt, dress pants and tie and leather shoes
D.
casual suit, long-sleeved and collard shirt, dress pants and tie and leather shoes
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【单选题】课文句子:Marshall burned her business suit and went on courses to learn more. 问题:Did Marshall really burn her business suit?
A.
Yes, she did.
B.
No, burning one's business suit means quitting one's job.
查看完整题目与答案
【单选题】Marshall burned her business suit and went on courses to learn more. What is the meaning of “burning one’s business suit”?
A.
burn the suit with fire
B.
become very angry
C.
quit one’s job
D.
the business of suit becomes prosperous
查看完整题目与答案
【单选题】"Marshall burned her business suit and went on courses to learn more." What does the phrase "burned her business suit" mean?
A.
her business suit was on fire
B.
her business suit was a fashion
C.
she resigned from her job
D.
she loved her job
查看完整题目与答案
【单选题】Who's this? [     ]
A.
This is Li Ming's father.
B.
He's a worker.
查看完整题目与答案
相关题目：
【单选题】φ 50H8的孔与 φ 49f7轴两者 ( ) 。
A.
可以形成基孔制间隙配合。
B.
可以形成基孔制过渡配 合。
C.
可以形成基孔制过盈配合。
D.
不属于配合。
查看完整题目与答案
【简答题】Who answers Li Ming's call?
查看完整题目与答案
【单选题】Marshall burned her business suit and went on courses to learn more. Did Marshall really burn her business suit?
A.
Yes,she did.
B.
No, she just throw away her suit.
C.
No. She resigned.
D.
We don't know.
查看完整题目与答案
【单选题】Who is the tallest?
A.
Li Ming.
B.
Tom.
C.
Jim.
查看完整题目与答案
【单选题】变压器运行时,其绕组和铁芯产生的损耗转变成( ),一部分被变压器各部件吸收使之温度升高,另一部分则散发到周围介质中。(1分)加油!必过!
A.
热量
B.
有功
C.
无功
查看完整题目与答案
【单选题】The business suit generally includes_______.
A.
business suit, short-sleeved and collard shirt, dress pants and tie and leather shoes
B.
business suit, long-sleeved and collard shirt, dress pants and tie and leather shoes
C.
smart suit, long-sleeved and collard shirt, dress pants and tie and leather shoes
D.
casual suit, long-sleeved and collard shirt, dress pants and tie and leather shoes
查看完整题目与答案
【单选题】课文句子:Marshall burned her business suit and went on courses to learn more. 问题:Did Marshall really burn her business suit?
A.
Yes, she did.
B.
No, burning one's business suit means quitting one's job.
查看完整题目与答案
【单选题】Marshall burned her business suit and went on courses to learn more. What is the meaning of “burning one’s business suit”?
A.
burn the suit with fire
B.
become very angry
C.
quit one’s job
D.
the business of suit becomes prosperous
查看完整题目与答案
【单选题】"Marshall burned her business suit and went on courses to learn more." What does the phrase "burned her business suit" mean?
A.
her business suit was on fire
B.
her business suit was a fashion
C.
she resigned from her job
D.
she loved her job
查看完整题目与答案
【单选题】Who's this? [     ]
A.
This is Li Ming's father.
B.
He's a worker.
查看完整题目与答案
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