如图所示是巧测薄板重心的实验此实验依据的原理是 A.重力的方�总是竖直�下 b.重力和拉力是一对平衡力它们的大小相等 C.重力和拉力是一对 Template




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tomski如图所示是巧测薄板重心的实验此实验依据的原理是 a.重力的方�总是竖直�下 b.重力和拉力是一对平衡力它们的大小相等 coloring