To support tungstun filament in electric bulb, the steel used is

1.	To support tungstun filament in electric bulb, the steel used is
A.	\[Cr\]
B.	\[Ni\]
C.	\[Mn\]
D.	\[Mo\]
Answer» E.

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To support tungstun filament in electric bulb, the steel used is

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