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41. | drilling instruments |
| 钻井仪表 |
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42. | instrumental variable |
| 仪表变量 |
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43. | aircraft instrument |
| 飞机仪表 |
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44. | primary instrument |
| 一次仪表 |
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45. | field instrument |
| 携带式仪表 |
|
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46. | Handsome looks |
| 仪表不凡 |
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47. | meter sensitivity |
| 仪表灵敏度 |
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48. | radiac instruments |
| 辐射仪表 |
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49. | thermocouple type instrument |
| 热电偶仪表 |
|
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50. | observing apparatus |
| 观测仪表 |
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