Hard materials have good resistance to（）and（）.
A.Wear
B.Impact
C.Abrasion
D.Torsion
正确答案：Wear；Abrasion
Hard materials have good resistance to（）and（）.
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The tensile strength of steel（MPa) is about 3.4 times of that of Brinell hardness.
Which one represents the hardest sample of Mohs hardness?
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