不定项选择如图所示静止在固定斜面上的物体受到的作用力有 A.重力支持力 b.重力支持力�擦力 C.重力支持力下�力�擦力 D Template




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tomski不定项选择如图所示静止在固定斜面上的物体受到的作用力有 a.重力支持力 b.重力支持力�擦力 coloring