A.减小第二个斜面的倾角小球在这斜面上仍然要达到原来的高度b.两个对接的斜面让静止的小球沿一个斜面滚下小球将滚上另一个斜面c.如果没有 Template




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tomskia.减小第二个斜面的倾角小球在这斜面上仍然要达到原来的高度b.两个对接的斜面让静止的小球沿一个斜面滚下小球将滚上另一个斜面c.如果没有 coloring