14.一个木块从斜面上�下并在水平面上继续�行如图.若斜面和水平面的表面粗糙程度相同下列说法正确的 A.木块下�是因为受到压力b Template




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tomski14.一个木块从斜面上�下并在水平面上继续�行如图.若斜面和水平面的表面粗糙程度相同下列说法正确的 a.木块下�是因为受到压力b coloring