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| 41. | four-step choir riser |
| 合唱团四级台阶 |
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| 42. | ACR Advanced Communications Riser |
| 高级通讯升级卡 |
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| 43. | AMR Audio/Modem Riser |
| 音效/数据主机板附加直立插卡 |
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| 44. | Riser cables-Sectional specification |
| 垂直布线电缆分规范 |
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| 45. | riser with slip joint |
| 伸缩式隔水管 |
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| 46. | riser knock-off ram |
| 打冒口锤 |
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| 47. | center distance of riser |
| 升气管中心距 |
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| 48. | riser with floatation modules |
| 有浮力装置的隔水管 |
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| 49. | steep-S flexible riser |
| 高弯度S形挠性立管 |
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| 50. | are you an early riser? |
| 你早起吗? |
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