如图所示从自行车的结构和使用来看下列说法中不正确的是 A.刹车装置相当于费力杠杆 B.轮胎和脚蹬上做有凹凸不平的花纹是为了增大�擦 C Template




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tomski如图所示从自行车的结构和使用来看下列说法中不正确的是 a.刹车装置相当于费力杠杆 b.轮胎和脚蹬上做有凹凸不平的花纹是为了增大�擦 coloring