base measuring pressure ; measuring pressure basis
压铸件测量基准 MEASURE DATUMS
测压水头亦应从同一基准面算起。
The piezometric head is also measured from the same datum level.
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通过试验舱的计算结果表明：平衡时间越长，基准物和被测物的温度差越小，压差越小；
The results show that the longer the balance time, the smaller the differential pressure and temperature.
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