命:题(6.0分)-|||-10.质量为0.01kg物体作周期为4s、振幅为-|||-0.24m的简谐振动。 t=0 时,位移 =0.24m 该谱-|||-振动表达式为() ()-|||-A =0.24cos (dfrac (pi )(2)t+pi )m-|||-B =0.24cos (dfrac (pi )(2)t+dfrac (pi )(2))=-|||-C =0.24cos dfrac (pi )(2)tm-|||-D =0.24cos (dfrac (pi )(2)t+dfrac (pi )(3))m