如图所示物体a重10nb重20n.两个相同的力f=4n同时作用在ab两个物体上使它们在平面c上同步做匀速直线运动.则ab间的�擦力 Template




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tomski如图所示物体a重10nb重20n.两个相同的力f=4n同时作用在ab两个物体上使它们在平面c上同步做匀速直线运动.则ab间的�擦力 coloring