如图所示用水平外力f将�板擦压在竖直的�板上保持静止当逐渐增大外力f时�板对�板擦的�擦力将 A.保持不变b.逐渐增大c.逐渐减小d Template




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tomski如图所示用水平外力f将�板擦压在竖直的�板上保持静止当逐渐增大外力f时�板对�板擦的�擦力将 a.保持不变b.逐渐增大c.逐渐减小d coloring