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| Q. |
Statement 2: Interferometry can be used to calibrate angle gauges. |
| A. | t, f |
| B. | f, f |
| C. | f, t |
| D. | t, t |
| Answer» C. f, t | |
| Explanation: direct combination of angle gauges can be made up to angle 81o40.9’. for the larger angle, square block is used with angle gauges. | |
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