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【单选题】
用铁锤将一铁钉击入木板, 设铁钉受到的阻力与其进入木块的深度成正比, 铁锤两次击钉的速度相同, 第一次将钉击入木板内1cm, 则第二次能将钉继续击入的深度为 [ ]
A.
0.4cm
B.
0.5cm
C.
1cm
D.
1.4cm
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