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51. | collimating beam |
| 准直光束 |
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52. | Beam grillage |
| 梁格 |
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53. | magneticlifting beam |
| 电磁吸吊装置 |
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54. | foundation beam |
| 基座梁 |
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55. | projecting beam |
| 投影光束 |
|
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56. | constrained beam |
| 两端固定梁 |
|
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57. | intermediate beam |
| 中间梁 |
|
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58. | contracted beam |
| 集中光束 |
|
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| |
59. | convergent beam |
| 会聚射束 |
|
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| |
60. | extensional beam |
| 外伸梁 |
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| |