1在图1中画出物体a所受重力g的示意图.2请在图2中作出重为20n的木箱受到的重力以及木箱对斜面的压力的示意图.3请在图3中按要求 Template




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tomski1在图1中画出物体a所受重力g的示意图.2请在图2中作出重为20n的木箱受到的重力以及木箱对斜面的压力的示意图.3请在图3中按要求 coloring