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【单选题】
当t=0时，一简谐弹簧振子正经过平衡位置向X轴正向运动，此弹簧振子的运动方程可表示为( )
A.
x ＝ Acos(ωt+π/2)
B.
v ＝ v max cos(ωt+π)
C.
a ＝ a max sin(ωt － π/2)
D.
x ＝ Acos(ωt+π3/2)
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