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| The device shown in the illustration is used to __________. GS-0029 |
| A) reduce the pressure in the ship's service air system |
| B) maintain correct tension on the drive belts while the compressor is in operation |
| C) grind sewage prior to entering the sewage treatment plant |
| D) unload the cylinders of an air compressor |
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Illustration GS-0029
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