物体a和b的质量分别为m1和m2叠放在质量为m的水平桌面上如图所示.在下列说法中正确的有 A.桌子受到a和b的作用它们的合力等于 Template




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tomski物体a和b的质量分别为m1和m2叠放在质量为m的水平桌面上如图所示.在下列说法中正确的有 a.桌子受到a和b的作用它们的合力等于 coloring