下列说法中正确的是 A.轻杆不同于轻绳弹力的方�可以不在杆的直线方�上b.有弹力必定有�擦力有�擦力必定有弹力c.�擦力的大小一定与 Template




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tomski下列说法中正确的是 a.轻杆不同于轻绳弹力的方�可以不在杆的直线方�上b.有弹力必定有�擦力有�擦力必定有弹力c.�擦力的大小一定与 coloring