如图所示将一个重为10n的木块沿倾角为30°斜面匀速�上拉至顶端拉力为8n斜面高5m拉力做功为80j木块所受的�擦力为3n.若仅使 Template




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tomski如图所示将一个重为10n的木块沿倾角为30°斜面匀速�上拉至顶端拉力为8n斜面高5m拉力做功为80j木块所受的�擦力为3n.若仅使 coloring