Which is the hardest?
a. 40 GPAb. 70 HRCc. 450 HBd. 95 HRBe. 300 kg/mm2f. 3125 MPa
a. 40 GPA
b. 70 HRC
c. 450 HB
d. 95 HRB
e. 300 kg/mm2
f. 3125 MPa
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