The piezometric head is also measured from the same datum level . 測(cè)壓水頭亦應(yīng)從同一基準(zhǔn)面算起。
Depths below datum are calculated from the corrected reflection times . 基準(zhǔn)面以下的深度,需要根據(jù)作過校正的反射波時(shí)間來計(jì)算。
This fixture should be provided with a reference leveling surface, so that it can be kept level as the balance deflects . 這種裝置應(yīng)該有一個(gè)水平基準(zhǔn)面,以便在天平變形時(shí)能夠使之保持水平。
All elevations are relative to chart datum 所有標(biāo)高均相對(duì)于海圖基準(zhǔn)面。
Chart datum for inland navigation 內(nèi)陸航行圖深度基準(zhǔn)面