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41. | lubricating plug |
| 注油栓 |
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42. | multiconductor plug |
| 多线插头 |
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43. | supporting plug |
| 支持柱塞 |
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44. | contacting plug |
| 连接器栓|插头 |
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45. | plug commutator |
| 插塞式交换机 |
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46. | concentric plug |
| 同心插头 |
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47. | preheating plug |
| 电热塞 |
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48. | capacitive plug |
| 电容插头 |
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49. | inspection plug |
| 检查塞 |
|
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50. | expendable plug |
| 一次性桥塞 |
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