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| T 形组合角钢; 角钢背距离 | |||
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| 背贴角钢; 背靠背拼合角钢; 背靠背组合角钢; 角钢背距离; T形组合角钢 (背对背设置的角钢) | |||
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back to back angles : 9 phrases in 4 subjects |
| Bridge construction | 1 |
| Construction | 1 |
| Oil / petroleum | 1 |
| Technology | 6 |
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