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| 杠杆弯沉仪 (贝克曼弯沉仪) | |||
| 杠杆弯沉仪; 杠杆挠度仪 (即贝克曼弯度仪) | |||
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lever deflectometer : 1 phrase in 1 subject |
| Rail transport | 1 |
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