logical track
| header
| logical track | |
| IT | 逻辑磁道 |
| header | |
| construct. | 丁头砖 |
| IT | card首 卡 、标题卡片 |
| IT од. | 首部; 报头 |
| mech. | 集气管 |
| met. | 头部 |
| roll. | 顶锻机; 镦粗机 |
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| 逻辑磁道 | |||
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logical track : 2 phrases in 1 subject |
| Electronics | 2 |