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| 21. | Construct two mutually orthogonal tangents of the deltoid. Where do they meet? |
| 三角星形线的两条互相垂直的法线的交点在哪里? |
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| 22. | The choice between two mutually exclusive possibilities. |
| 两者择一，抉择对两个互相排斥的可能情况的选择 |
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| 23. | War and peace are both mutually exclusive and interconnected and can be transformed into each other under |
| 战争与和平既互相排斥，又互相联结，并在一定条件下互相转化。 |
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| 24. | In every state of stress there exist at least three principal planes, which are mutually perpendicular |
| 对每一种应力状态，至少存在三个主平面，它们互相垂直。 |
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| 25. | Make two or more pleading which are mutually exclusive. |
| 进行两个或两个以上的通常互相排斥的抗辩。 |
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| 26. | A corner cube consists of three mutually perpendicular reflecting planes. |
| 角棱镜是由3个互相垂直的反射平面组成。 |
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| 27. | Make two or more pleading which be mutually exclusive |
| 进行两个或两个以上的通常互相排斥的抗辩 |
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| 28. | The decomposition of a set into a family of mutually exclusive sets. |
| 划分，分类把一个集合分拆成几个互相排斥的集合族 |
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| 29. | Make two or more pleading which is mutually exclusive. |
| 进行两个或两个以上的通常互相排斥的抗辩。 |
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| 30. | an arch with mutually supporting voussoirs that has a straight horizontal extrados and intrados. |
| 有水平拱背和水平的内弧面的互相支撑的拱石的拱。 |
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