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41. | contact minesweeping gear |
| 接触扫雷器 |
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42. | imperfect contact |
| 不良接触 |
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43. | conical contact |
| 锥形接触 |
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44. | contact phenomena |
| 接触现象 |
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45. | contact aerator |
| 接触曝气池 |
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46. | contact metamorphic action |
| 接触变质 |
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47. | contact drawing |
| 接触绘图 |
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48. | contact operating form |
| 接触方式 |
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49. | contact measurement |
| 接触测定 |
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50. | contact potential difference |
| 接触电位差 |
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