hardness

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hardness

1.The hardness of mica is（）.2.Most ceramic materials have high hardness and high-temperature strength but tend to be（）.3.What are the typical methods for penetration testing of hardness?4.Which one represents the hardest sample of Mohs hardness?5.The tensile strength of steel（MPa) is about 3.4 times of that of Brinell hardness.