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Q. |
In order to reduce wear and eliminate scuffing, piston ring in internal combustion engines are |
A. | Made of soft material |
B. | Provided with grooves |
C. | Lubricated thoroughly |
D. | Made of square section |
E. | Plated with chromium, cadmium or phosphate |
Answer» E. Plated with chromium, cadmium or phosphate |
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