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【单选题】
杆O1B以匀角速度w绕O1轴转动,通过套筒A带动杆O2B绕O2轴转动,若O1O2 =O2A =l,q = wt,则用自然坐标表示(以O1为原点,顺时针转向为正向)的套筒A的运动方程s为 ( )。A.
；
B.
；
C.
；
D.
。
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