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| Q. |
grades wire are used in automatic re-threading mechanisms. |
| A. | malleable |
| B. | softer |
| C. | harder |
| D. | commercial |
| Answer» C. harder | |
| Explanation: the harder grades are used in automatic re-threading mechanisms and also if the machined shapes contain high flat surfaces. hard wires resist change in direction and for that reason are likely to produce nice flat surfaces. | |
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