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| 71. | rejuvenation head |
| 回春源头 |
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| 72. | head bookkeeper |
| 主管簿记员 |
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| 73. | head installation |
| 首站设施 |
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| | |
| 74. | torispherical head |
| 碟形封头 |
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| | |
| 75. | commutator head |
| 整流子头 |
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| 76. | rejuvenate head |
| 回春点 |
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| | |
| 77. | tachometer head |
| 测速磁头 |
|
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| | |
| 78. | piezometric head |
| 测压水头 |
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| 79. | hyperbolic head |
| 双曲线磁头 |
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| 80. | differential head |
| 不等压头 |
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