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| 地名，美国衣阿华 、内布拉斯州等诸州基斯通 | |||
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| 主〔要〕旨; 梯形失真; 梯形畸变; 拱心〔顶〕石; 冠石 | |||
| 枢石 | |||
| 拱顶嵌缝石 | |||
| 梯楔形; 块形 | |||
| 二垒 | |||
| 基本原理; 加倍定价 | |||
| 楔形畸变 | |||
| 填缝石; 拱心石 | |||
| 拱顶石; 顶石 | |||
| 要旨; 根本原理 | |||
| 楔石 | |||
| 用拱顶石支承; 拱冠石; 嵌缝石; 锁砖; 塞缝石; 一种用于新水泥工程的油漆; 锁石; 嵌缝骨料; 嵌缝碎石 | |||
| 关键; 主旨; 梯形失真 | |||
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Keystone : 75 phrases in 25 subjects |
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