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| 计算管子疲劳强度用应力一次数 | |||
| 应力-循环数〔曲线〕 | |||
| stress-number: 20 phrases in 6 subjects |
| Automobiles | 2 |
| Bridge construction | 1 |
| Metallurgy | 9 |
| Space | 2 |
| Steel production | 1 |
| Technology | 5 |
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