一质点做简谐运动的图象如图所示下列说法正确的是a.质点振动�率是4hz b.在10s内质点经过的路程是20cm c.第4s末质点的速度是零 Template


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tomski一质点做简谐运动的图象如图所示下列说法正确的是a.质点振动�率是4hz b.在10s内质点经过的路程是20cm c.第4s末质点的速度是零 coloring