McqMate
| Q. |
The percentage of carbon that must be present in steel before it can be hardened noticeably is |
| A. | 0.20 percent |
| B. | 0.30 percent |
| C. | 0.70 percent |
| D. | 0.10 percent |
| E. | 0.05 percent |
| Answer» A. 0.20 percent | |
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