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| 71. | gully head protectio |
| 沟头防护 |
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| 72. | concave head bolt |
| 凹头螺栓 |
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| 73. | lost velocity head |
| 损失速度头 |
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| 74. | read/write head |
| 读写兼用头 |
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| 75. | swivel control head |
| 旋转控制头 |
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| 76. | hexagonal head wrench |
| 六角头扳手 |
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| 77. | moving head disk |
| 移动头磁盘 |
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| 78. | infrared sensing head |
| 红外灵敏头 |
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| 79. | magnetic write head |
| 磁写头 |
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| 80. | reproducing head sensitivity |
| 放音头灵敏度 |
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