60. 淬過火之鋼料使用鑽石圓錐壓痕器所測定之硬度表示符號為
(A)HB
(B)HRB
(C)HS
(D)HRC
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統計: A(0), B(0), C(0), D(16), E(0) #2537825
統計: A(0), B(0), C(0), D(16), E(0) #2537825