Has a very high hardness which is comparable to that of diamon

Has a hardness which is slightly more than due of HSS

Is used for making cylinder blocks of aircraft engines

Is used for making optical glasses

Cubic boron nitride:

1.	Cubic boron nitride:
A.	Has a very high hardness which is comparable to that of diamon
B.	Has a hardness which is slightly more than due of HSS
C.	Is used for making cylinder blocks of aircraft engines
D.	Is used for making optical glasses
Answer» E.

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Cubic boron nitride:

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