如图甲所示完全相同的木块a和b叠放在水平桌面上用弹簧测力计拉动ab一起作匀速直线运动示数f1=12n此时木块a所受的�擦力为12n Template




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tomski如图甲所示完全相同的木块a和b叠放在水平桌面上用弹簧测力计拉动ab一起作匀速直线运动示数f1=12n此时木块a所受的�擦力为12n coloring