如图卷扬机的绳索通过定�轮用力f 拉位于粗糙斜面上重为g的木箱使之沿斜面匀速�上移动.在移动过程中木箱受到斜面的�擦力为ff.下列说法 Template




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tomski如图卷扬机的绳索通过定�轮用力f 拉位于粗糙斜面上重为g的木箱使之沿斜面匀速�上移动.在移动过程中木箱受到斜面的�擦力为ff.下列说法 coloring