| (subclass PureTwopole Twopole) | engineering.kif 498-498 | 纯双极 是 双极 的 subclass |
| (subclass IdealSwitch PureTwopole) | engineering.kif 501-501 | 理想的开关 是 纯双极 的 subclass |
| (subclass IdealTwopole PureTwopole) | engineering.kif 506-506 | 理想的双极 是 纯双极 的 subclass |
| (subclass Dissipator PureTwopole) | engineering.kif 509-509 | 消减器 是 纯双极 的 subclass |
| (subclass AcrossVariableAccumulator PureTwopole) | engineering.kif 513-513 | 跨变量累加器 是 纯双极 的 subclass |
| (subclass ThroughVariableAccumulator PureTwopole) | engineering.kif 517-517 | 通过变量累加器 是 纯双极 的 subclass |
| (subclass Source PureTwopole) | engineering.kif 520-520 | 资源 是 纯双极 的 subclass |
| (subclass ElectricalTwopole PureTwopole) | engineering.kif 531-531 | 电气双极 是 纯双极 的 subclass |
| (subclass TranslatoryTwopole PureTwopole) | engineering.kif 569-569 | 翻译双极 是 纯双极 的 subclass |
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