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41. | address key register |
| 地址键寄存器 |
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42. | load reducing key |
| 减荷键 |
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43. | memory minus key |
| 减存键 |
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44. | random file key |
| 随机文件键 |
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45. | memory plus key |
| 加存键 |
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46. | knuckle arm key |
| 关节臂键 |
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47. | three position key |
| 三位式键 |
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48. | manual load key |
| 人工输入键 |
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49. | memory clear key |
| 存储器清除键 |
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50. | reset clear key |
| 复位清除键 |
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