- hydraulic tachometer
- 速: fast; rapid; quick; speedy
- 头: 5点就得动身 have to start before ...
- 转速计: tachometer; tachoscope; velo ...
- 转速计: tachometer; tachoscope; velometer; revolution counter; cycloscope◇转速计稳定系统 tachometer stabilized system
- 计速计；转速计: tachometer
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