73.如图甲所示完全相同的木块a和b叠放在水平桌面上在12n的水平拉力f1作用下ab一起作匀速直线运动此时木块b所受的�擦力为 N Template




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tomski73.如图甲所示完全相同的木块a和b叠放在水平桌面上在12n的水平拉力f1作用下ab一起作匀速直线运动此时木块b所受的�擦力为 n coloring