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| 锥形截面; 二次曲线; 圆锥曲线 | |||
| 圆锥截面 | |||
| 圆锥 〔二次〕曲线; 锥体截面 | |||
| 圆锥形截面; 锥体部分; 二次圆锥曲线 | |||
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conical section : 6 phrases in 3 subjects |
| Plastics | 2 |
| Polymers | 1 |
| Technology | 3 |
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