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滑块开始下滑的角度 theta （静摩擦系数 \mu_s = 0,3 ）？ theta = arctan \mu_s 。（答：。）
滑块开始下滑的角度 theta （静摩擦系数 \mu_s = 0,3 ）？ theta = arctan \mu_s 。（答：。）
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