[Solved] Which of the following is high speed steel?

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Q.	Which of the following is high speed steel?
A.	T 55 Ni Cr 65 Mo 30
B.	T 75 W 18 Co 6 Cr 4
C.	T 10 Cr 5 Mo 75 V 23
D.	T 75 W 18 Co 6 Cr 4 V 1 Mo 75
E.	None of the above
Answer» D. T 75 W 18 Co 6 Cr 4 V 1 Mo 75

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