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| 51. | defoliating head |
| 摘头叶 |
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| 52. | Fire extinguisher actuator head. Double head with connectors. |
| 灭火器激励器头。有连接器的双头。 |
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| 53. | elliptical head |
| 椭圆封头 |
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| 54. | hemispherical head |
| 球形封头 |
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| 55. | superfinishing head |
| 超精加工头 |
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| 56. | tensioning head |
| 张拉头 |
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| 57. | humeroulnar head |
| 肱尺头 |
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| 58. | distilling head |
| 蒸镏头 |
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| 59. | torispherical head |
| 碟形封头 |
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| 60. | breakwater head |
| 防波堤堤头 |
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