如图所示物块ab叠放在固定的斜面c上若ab一起沿斜面匀速下�设ab间的�擦力为f1bc间的�擦力为f2则af1≠0f2 Template




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tomski如图所示物块ab叠放在固定的斜面c上若ab一起沿斜面匀速下�设ab间的�擦力为f1bc间的�擦力为f2则af1≠0f2 coloring