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1. |
What is the value of hardness for plug and ring gauges used for self-holding tapers? |
A. | 750 to 860 HV |
B. | 120 to 540 HV |
C. | 550 to 740 HV |
D. | 900 to 1200 HV |
Answer» B. 120 to 540 HV | |