24.小芳同学设计了一个高度可调节的斜面来探究斜面的省力情况斜面的机械效率与斜面的倾斜程度之间的关系如下图所示她首先测出小车重然后用 Template




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tomski24.小芳同学设计了一个高度可调节的斜面来探究斜面的省力情况斜面的机械效率与斜面的倾斜程度之间的关系如下图所示她首先测出小车重然后用 coloring