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21. | Memory Span Test |
| 记忆广度测验 |
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22. | unsupported span |
| 管道无支撑跨距 |
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23. | horizontal span |
| 水平跨距 |
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24. | multiple beam span |
| 多梁桥跨 |
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25. | valley-span antenna |
| 山谷天线 |
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26. | memory span method |
| 记忆广度法 |
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27. | infinite span wing |
| 无限翼展机翼 |
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28. | mid-span moment |
| 跨中弯矩;跨中力矩 |
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29. | depth-span ratio |
| 高跨比 |
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30. | multiple span bridge |
| 多孔桥 |
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