15.如图所示所受重力为g的均匀小球放在倾角为α的斜面上球被与斜面夹角为θ的木板挡住球面木板均光�.若使球对木板压力最小则木板与斜面 Template




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tomski15.如图所示所受重力为g的均匀小球放在倾角为α的斜面上球被与斜面夹角为θ的木板挡住球面木板均光�.若使球对木板压力最小则木板与斜面 coloring