题型:问答题 简答题 一质点绕半径为R的圆圈运动了一周,如图所示,则其位移大小为_____,路程是____,若质点运动了l 周,则其位移大小为______,路程是____,此运动过程中最大位移大小是____,最大路程是______。 查看答案
题型:问答题 简答题 -Shall we invite Tom to play football now?-Oh, no. He __________ his clothes.[ ]A. is washingB. washesC. has washed 查看答案