如图质量为m 的物体沿倾角为的斜面匀速下�.下列说法正确的是 A.物体所受合力的方�沿斜面�下 B.斜面对物体的支持力等于物体的重力 Template




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tomski如图质量为m 的物体沿倾角为的斜面匀速下�.下列说法正确的是 a.物体所受合力的方�沿斜面�下 coloring