4.如图所示abc三个物体的质量相等有f=1n的两个水平力作用于ab两个物体上abc都静止则地面对a物体a物体对b物体b Template




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tomski4.如图所示abc三个物体的质量相等有f=1n的两个水平力作用于ab两个物体上abc都静止则地面对a物体a物体对b物体b coloring