质点沿直线运动的运动学方程为x=2+6t-t2(SI)，则质点速度为零时X等于( )-湖北继续教育网网校

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[单选题]质点沿直线运动的运动学方程为x=2+6t-t2(SI)，则质点速度为零时X等于( )

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