如图所示一倾斜木板上放一物体当板的倾角θ逐渐增大时物体始终保持静止则物体所受 A�擦力变大 B支持力变大 C合外力恒为零 D合 Template




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tomski如图所示一倾斜木板上放一物体当板的倾角θ逐渐增大时物体始终保持静止则物体所受 a�擦力变大 b支持力变大 coloring