[KongchangAI]
Unverified70% confidenceFactExact time

经济史学家保罗·大卫(Paul David)研究发现,电力从1880年代商业化到1920年代真正推动制造业生产率显著提升,历经近40年时滞

2
Sources
70%
Confidence
Long-term
Relevance
7/8/2026
First Seen

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