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| 环形加强肋 | |||
| 补强环 | |||
| 加固环 | |||
| 加强环 | |||
| 补强环［圈］ | |||
| 刚性环; 加强圈; 加劲环; 加固圈; 补强圈 | |||
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| 加强圈 | |||
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stiffening ring : 5 phrases in 1 subject |
| Technology | 5 |
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