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41. | bus-oriented backplane |
| 总线用底板 |
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42. | foundation plate |
| 底板,基础板 |
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43. | memory card chassis |
| 存储插件底板 |
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44. | hopper bottom plate |
| 箱斗底板 |
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45. | bottom board of hooks |
| 针钩底板 |
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46. | baseplate phase control |
| 底板相位控制 |
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47. | slide of tail stock bottom |
| 尾座底板 |
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48. | floor pressure arch |
| 底板压力拱 |
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49. | contour map of seam floor |
| 矿层底板等高线图 |
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50. | wire-wrapped pane |
| 绕焊底板 |
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