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51. | square butt weld |
| 无坡口对接焊 |
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52. | Apollo docking test device |
| 阿波罗飞船对接试验装置 |
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53. | angle butt weld |
| 斜口对接焊缝 |
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54. | open square butt joint |
| 平头开口对接焊 |
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55. | angle butt welding |
| 斜口对接焊 |
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56. | single-welded butt joint with back |
| 带垫板单面对接焊 |
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57. | double u butt groove weld |
| 双u形对接焊 |
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58. | single buttstrap |
| 单对接搭板 |
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59. | cornerlock joint |
| 直钉榫对接 |
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60. | double butt strap joint |
| 双对接搭板接合 |
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