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carbene
卡宾
碳原子与两个基团以化学键相连,另有两个未成键电子的物种,一般以R2C∶表示。又称碳宾、碳烯。
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carbene
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Poncelet
poncelet
Poncelet closure theorem
Poncelet coaxal theorem
Poncelet continuity principle
Poncelet crater
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Poncelet-Steiner construction
Poncelet-Steiner theorem
Poncelet theorem
Poncelet transform
Poncelet transverse
pond
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