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15.一质点开始时做匀速直线运动,从某时刻起受到一恒力作用。此后,该质点的动能可能(A). 一直增大(B). 先逐渐减小至零,再逐渐增大(C). 先逐渐增大至某一最大值,再逐渐减小(D). 先逐渐减小
問題詳情
15.一质点开始时做匀速直线运动,从某时刻起受到一恒力作用。此后,该质点的动能可能
(A). 一直增大
(B). 先逐渐减小至零,再逐渐增大
(C). 先逐渐增大至某一最大值,再逐渐减小
(D). 先逐渐减小至某一非零的最小值,再逐渐增大
參考答案
答案:A,B,D
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)
上一篇 :
【題組】38, (A). smart (B). sweet (C). slow (D). shy
下一篇 :
【題組】47. (A). regretted (B). remembered (C). concluded (D). confirmed
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