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| 51. | 1、 使学生认识长方体、方体，并掌握长方体、方体的特征。 |
| Get the students to learn about cuboids and cubes. Grasp the features of cuboids and cubes. |
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| 52. | acoustic character log |
| 声波特征测井 |
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| 53. | character of the bottom |
| 海底特征 |
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| 54. | character distribution analysis |
| 特征分布分析 |
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| 55. | axial character representation |
| 轴角特征表示 |
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| 56. | spectrum character curve |
| 波谱特征曲线 |
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| 57. | one-dimensional character |
| 一维特征标 |
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| 58. | unitary character |
| 酉特征标 |
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| 59. | reduced character |
| 约化特征标 |
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| 60. | shallow waveform character |
| 浅层波形特征 |
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