15.如图质量为m的三角形木块a静止在水平面上.一质量为m的物体b正沿a的斜面下�三角形木块a仍然保持静止则下列说法中正确的是 A.a对 Template




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tomski15.如图质量为m的三角形木块a静止在水平面上.一质量为m的物体b正沿a的斜面下�三角形木块a仍然保持静止则下列说法中正确的是 a.a对 coloring