21.如图所示长为l的木板ab放在水平面上它的下表面光�而上表面与物体的动�擦因数为μ一个质量为m电荷量为 Q的小物块c从a端以某一初 Template




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tomski21.如图所示长为l的木板ab放在水平面上它的下表面光�而上表面与物体的动�擦因数为μ一个质量为m电荷量为 q的小物块c从a端以某一初 coloring