Steel balls for ball bearings are generally made of ______________ steel?

A. Boron
B. Antimony
C. Gallium
D. None of these

A. Shafts
B. Flanges
C. Gears
D. Shear blades

A. Stainless steel
B. Cast iron
C. Titanium
D. Hastelloy C

A. Brittle
B. Hard
C. Rollable
D. Soft

A. Cu (55%) & Sn (45%)
B. Cu (55%) & Ni (45%)
C. Pt (95%) & Rh (10%)
D. Fe (80%) & Ni (20%)