如图1 1所示物体a在光�的斜面上沿斜面下�则a受到的作用力是 A重力弹力和下�力 B重力和弹力 C重力和下�力 D重力 Template




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sketch #3818 เดียวจะวาดใหม่ยังไม่เสร็จๆ

tomski如图1 1所示物体a在光�的斜面上沿斜面下�则a受到的作用力是 a重力弹力和下�力 coloring