ab两物块叠加静止在斜面上如图所示关于ab受的�擦力下列说法正确的是 A.a与b 均静止所以ab之间无�擦力 B.a不受 Template




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tomskiab两物块叠加静止在斜面上如图所示关于ab受的�擦力下列说法正确的是 a.a与b 均静止所以ab之间无�擦力 coloring