如图所示物块a放在倾斜的木板上木板的倾角a分别为30°和45°时物块所受�擦力的大小恰好相同则物块和木板间的动�擦因数为a. b. c Template




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tomski如图所示物块a放在倾斜的木板上木板的倾角a分别为30°和45°时物块所受�擦力的大小恰好相同则物块和木板间的动�擦因数为a. b. c coloring