- hydrologic apparatus
- hydrologic instrument
- hydrological instrument
- 水文: hydrology
- 仪器: instrument; appliance; appar ...
- 水文仪器安全要求: general specification for hydrologic instrument safety requirements
- 水文仪器系列型谱: the series model of hydrometric instruments
- 水文仪器可靠性技术要求: specification of reliability for hydrologic instruments
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