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【单选题】
螺钉的直径是10mm，螺钉旋入螺纹的长度bm与旋入零件的材料有关，如果旋入零件的材料是钢，则bm=？A.
10 左右
B.
15 左右
C.
20 左右
D.
25 左右
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A.
told, to make
B.
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