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| Resonant vibrations, which can cause machinery failure, occur when which of the following conditions happen? |
| A) A forced frequency is placed on a piece of operating machinery. |
| B) The natural frequency of the machinery is the same as the free vibration frequency. |
| C) The machinery is operated at the natural frequency with no external forces in play. |
| D) The frequency of an external vibration is the same as one of the natural frequencies of the machinery. |
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