The piezometric head is also measured from the same datum level . 测压水头亦应从同一基准面算起。
Depths below datum are calculated from the corrected reflection times . 基准面以下的深度,需要根据作过校正的反射波时间来计算。
This fixture should be provided with a reference leveling surface, so that it can be kept level as the balance deflects . 这种装置应该有一个水平基准面,以便在天平变形时能够使之保持水平。
All elevations are relative to chart datum 所有标高均相对于海图基准面。
基准;基准面: datum基准线;基准面: datum line安装基准面: erection datum plane; erection reference plane剥蚀基准面: base level of denudation爆破基准面: shot datum标准基准面: standard datum plane冰川基准面: glacier table参考基准面: reference datum参考面, 基准面: reference surface参考面,基准面: reference surface测深基准面: sounding datum潮高基准面: tidal datum plane潮位基准面: datum of tidal level; tidal datum plane潮汐基准面: tidal datum plane潮信基准面: tidal datum沉积基准面: base level of deposition沉降基准面: founding level次基准面: subbase level大地基准面: datum; geodesic level; geodetic level当地基准面: local base level低潮基准面: low tide water datum; low water datum地方基准面: local datum地震基准面: seismic datum耳机基准面: reference plane of earphone基准面,参考点: reference point基准锚头: reference anchor