在图a和图b中,物块 I 重 P 1 =1.5 kN ,物块II重 P 2 ,拉力为 T 2 b ,且 T 2 b = P 2 =3 kN ,滑轮质量略去不计。则 两种情况下,滑轮同侧绳子的拉力相等。
A.
正确
B.
错误
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举一反三
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