不定项选择关于弹力的方�以下说法正确的是a.压力的方�总是垂直于接触面并指�被压物体 b.支持力的方�总是垂直于支持面并指�被支持物体 Template




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tomski不定项选择关于弹力的方�以下说法正确的是a.压力的方�总是垂直于接触面并指�被压物体 b.支持力的方�总是垂直于支持面并指�被支持物体 coloring