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【多選題】
長為L的輕桿,一端固定一個小球,另一端固定在光滑的水平軸上,使小球在豎直面內(nèi)做圓周運動,關(guān)于最高點的速度v,下列說法中正確的是
A.
v的極小值為
B.
v由零逐漸增大,向心力也增大
C.
當v由
逐漸增大時,桿對小球的彈力逐漸增大
D.
當v由
逐漸減小時,桿對小球的彈力逐漸增大
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參考答案:
舉一反三
【單選題】The WHO’s attitude to e-cigarettes can be best described as __________.
A.
favorable
B.
doubtful
C.
neutral (中立的)
D.
optimistic
查看完整題目與答案
【單選題】The actress has to ___a diet to lose weight because she is to act a pretty slim girl in a film.
A.
take on
B.
carry on
C.
go on
D.
have on
查看完整題目與答案
【單選題】The books in the largest library of the city could _____ all the information we need.
A.
offer
B.
supply
C.
provide
D.
present
查看完整題目與答案
【單選題】Which of the following statements about e-cigarettes is TRUE according to the passage?
A.
E-cigarettes use batteries as power.
B.
E-cigarettes can replace real cigarettes.
C.
E-cigarettes can help smokers stop smoking.
D.
E-cigarettes can produce some smoke that is not smelly.
查看完整題目與答案
【單選題】I soon found that the work I was doing had already been done by someone else—_____, I was wasting my time.
A.
to make things worse
B.
in other words
C.
at the same time
D.
for another thing
查看完整題目與答案
相關(guān)題目:
【單選題】The WHO’s attitude to e-cigarettes can be best described as __________.
A.
favorable
B.
doubtful
C.
neutral (中立的)
D.
optimistic
查看完整題目與答案
【單選題】The actress has to ___a diet to lose weight because she is to act a pretty slim girl in a film.
A.
take on
B.
carry on
C.
go on
D.
have on
查看完整題目與答案
【單選題】The books in the largest library of the city could _____ all the information we need.
A.
offer
B.
supply
C.
provide
D.
present
查看完整題目與答案
【單選題】Which of the following statements about e-cigarettes is TRUE according to the passage?
A.
E-cigarettes use batteries as power.
B.
E-cigarettes can replace real cigarettes.
C.
E-cigarettes can help smokers stop smoking.
D.
E-cigarettes can produce some smoke that is not smelly.
查看完整題目與答案
【單選題】I soon found that the work I was doing had already been done by someone else—_____, I was wasting my time.
A.
to make things worse
B.
in other words
C.
at the same time
D.
for another thing
查看完整題目與答案
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