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| 51. | short span structure |
| 短跨结构 |
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| 52. | digit span test |
| 数字广度测验 |
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| 53. | maximum unsupported span |
| 最大自由跨距 |
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| 54. | two span bridge |
| 双跨度桥 |
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| 55. | span of consciousness |
| 意识广度 |
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| 56. | shorten the span |
| 缩短时间 |
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| 57. | single span derrick |
| 单跨距吊杆；单条顶张索吊货杆 |
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| 58. | running memory span |
| 流动记忆范围 |
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| 59. | multi span structure |
| 多跨结构 |
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| 60. | life-span determination |
| 寿命测定 |
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