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| 周期性荷载; 周期性负载 | |||
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| 周期荷载 | |||
| 周期性荷载; 周期性负载 | |||
| 周期负荷 | |||
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periodical load : 12 phrases in 3 subjects |
| Bridge construction | 1 |
| Electronics | 1 |
| Technology | 10 |
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