| No TPTP formula. May not be expressible in strict first order. | engineering.kif 651-651 | 子類 諧振 and 自然過程 |
| No TPTP formula. May not be expressible in strict first order. | engineering.kif 654-654 | 子類 機械共振 and 諧振 |
| No TPTP formula. May not be expressible in strict first order. | engineering.kif 658-658 | 子類 電共振 and 諧振 |
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