A、 dfrac (pi )(6) B、 dfrac (2pi )(3) C、 dfrac (4pi )(3) D、 dfrac (pi )(3)-|||-2、一简谐振动曲线如图所示,则该振动的初相为 ()-|||-A、 dfrac (pi )(6) B、 dfrac (2pi )(3) C、 -dfrac (2pi )(3) D、 -dfrac (pi )(6)-|||-x-|||-4-|||-o-|||-2 is-|||--2

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