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运动和力[下学期]
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B.侧放时最小
C.立放时最小
D.都相同用弹簧秤拉木块沿水平桌面滑动，第一阶段使A以1m/s的速度匀速运动，弹簧秤的读数是F1；第二阶段使A的速度从1m/s慢慢增加为2m/s，弹簧秤的读数是F2；第三阶段再使A维持2m/s的速度匀速运动，弹簧秤的读数是F3（水平桌面的粗糙程度是均匀不变的），则：
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